Teamspeak v3† solves this in an interesting way: the program supports creation of anonymous (or rather, pseudonymous) identities easily, each associated with an

Teamspeak v3† solves this in an interesting way: the program supports creation of anonymous (or rather, pseudonymous) identities easily, each associated with an unique ID which takes adjustable amount of time to compute on users' computers. The adjustable parameter, called "Security Level", is expressed as a small integer. To protect from flood of new (spam) identities, channel owners / operators can select minimum difficulty allowed on the channel. The higher the Security Level required, the more time it takes to create such identity. Values around 24 represent a dozen seconds worth of computation, while around 28 is a few minutes.‡ This easily discourages casual spammers, while legit users have no problem with spending a few dozen seconds, or a few minutes to create an identity. † VoIP team chat, used by gamers. ‡ more information: http://forum.teamspeak.com/showthread.php/47502-Security-level-huh http://forum.teamspeak.com/showthread.php/47502-Security-lev...