Meanwhile, both KaZaA and Music City's Morpheus share a similar technology from a European company named FastTrack. Their version of peer-to-peer file sharing features a particularly well developed approach to "metadata" -- extra information tagged to each file that enables users to target searches better and find out more about files before downloading them.

Out of Texas comes Audiogalaxy, a service that lets you conduct your music searches in your Web browser and then shunts your downloads to a nifty helper application. The OpenNap project makes it possible to run Napster-like servers while bypassing the "official" Napster network; WinMX is a popular client for OpenNap servers. Aimster adopts the instant-messaging model as a basis for organizing file sharing; the Freenet project places its emphasis on anonymity to help protect freedom of expression by dissidents under repressive regimes. Direct Connect provides service based on how many files you contribute to the network; eDonkey2000 is favored by traders of movie files; Mojo Nation builds a credit/debit marketplace into its system.

You'll find dozens of different kinds of file-sharing programs to download at CNet's Download.com. You'll even find a portal with information about all the different contenders at Zeropaid. In many cases these systems, unlike Napster, allow for the trading of all sorts of files, not just music, opening the door to an inevitable explosion of porn traffic.

Some of these projects take an openly hostile stance toward the music industry (the Aimster home page boasts a pistol-packing blond over the words "Take AIM at the RIAA"); others are more corporate-friendly and boast of their compatibility with various intellectual-property protection (or "digital rights management") schemes. Some work beautifully some of the time and then mysteriously fail or go offline; most are in various stages of "beta" development and frequently issuing new upgrades and patches. In the days following the Napster outage many of them experienced a sudden influx of new users and a resulting strain on their networks.

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In my informal sampling of a half-dozen services, none of them offered as unbelievably complete and deep a selection of popular and obscure music as Napster did at its zenith. On the other hand, many did offer just as compelling an experience as Napster did when I first started using it a year and a half ago.

That puts them in a different class from the much-ballyhooed and still-nascent new online music services being hatched by the music industry itself. These yet-to-be-unveiled entrants in the field -- including MusicNet, Pressplay and FullAudio -- are all promising variations on the same theme: subscription-based access to large catalogs of music files, all treated with a variety of copyright-protection schemes. And they share a common set of Achilles' heels: First, experience suggests that most copyright-protection schemes tend to be clumsy and annoying and turn off users (and we won't know whether these services have avoided that problem until they open their doors). Second, it remains to be seen whether these "official" offerings can or would provide the kind of oddball tracks, bootleg live recordings and rarities that attract so many diehard fans to file sharing in the first place.

Finally, and most important, these services -- as spawn of the music industry itself -- are organized around labels, and that means that their offerings are likely to be incomplete. Unless the music industry can get its act together with comprehensive cross-licensing to provide the entire recorded catalog of music on multiple competing services, the consumer will be in the ridiculous position of having to remember which label a particular artist is carried by in order to find that artist's work on one or another of the "official" services. Which just gives the general public another reason to ignore these offerings and stick with the range of Napster alternatives that are already being embraced.

How big is the Napster diaspora likely to be -- and how long can it last? Clearly, few of the new technologies and services are likely to grow to the proportions of the pre-RIAA-lawsuit Napster; in fact, no more than a handful will probably survive. This type of software has now entered the "explosion and differentiation" part of the development cycle of any Internet innovation -- the part where a plethora of competitive alternatives arise, and the online public, employing the power of networked word of mouth and voting with its feet, determines which is the best. All that's different with the post-Napster crowd is that, in addition to the usual criteria by which the competition's winner will be judged -- reliability, low cost, features and so on -- there's a new category in which the survivors will have to excel: How well are they protected from legal assault?

Some will be vulnerable to the same kind of lawsuit that has hobbled Napster, but many others will not, and the harder the RIAA pushes the legal strategy, the more it will push the public -- and the developers -- toward the decentralized, noncommercial alternatives, those best inoculated against legal suppression. When that happens, the music industry will face the ultimate disaster toward which it has been heading ever since it decided to take Napster to court: To enforce its copyrights, it will need to take legal action against the hundreds, thousands or millions of individuals who have taken up file sharing with alacrity -- individuals formerly known as customers. Down that impractical road lies only commercial suicide.

It didn't have to be this way, of course. The music industry has had the opportunity for several years now to begin offering reasonably priced access to comprehensive catalogs of digital music across the Internet, sweetened with special premium additions for fans willing to pay even more. Such a service could satisfy the hunger of millions of people for ready access to new and old music while preserving a reasonable income for the artists who make that music. Fear has stayed the industry's hand -- fear that today's unconscionably high CD prices can't be sustained; fear that the many layers of middlemen in today's industry might find themselves out of jobs; fear that the superstar system couldn't survive such a change; fear of the unknown.

The industry's paralysis is a tragedy for anyone who believes that artists should be compensated for their work as well as for anyone who loves music, period. But it's clear that the record labels would rather sue than find a sensible rapprochement with the new world of digital distribution.

To date, though, all their legal strategy has accomplished is to radicalize the community of online music fans and accelerate the process of technological change. Meanwhile, though Napster use is way down this year, it seems that music sales are, too.

Gee, could there be any connection there?

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