We've got a new service in our repertoire. :) Trepia via libgaim is now available. You'll need to make an account via the official client, which is windows-only, to use it... it works quite nicely, complete with buddy image support. Profiles aren't in yet.

Note that Trepia is part of gaim CVS but not officially supported (it does not build by default with gaim installations, for example) and therefore may not be perfect. Cool stuff, though.