Anyway, I'm signed on to it now, just to see if I can. You'll need a Jabber client (I'm using GAIM since I already have it installed).
If you're bored and want to try it out, here are the settings that work for me:
Screen Name: (gmail accountleave out @gmail.com)
Password: (your gmail password)
(Show more options)
[X] Use TLS
[ ] Force old SSL
[ ] Allow plaintext auth
Connect Svr: talk.google.com
(You don't have to register with the server... just connect).
Uhm.. yeah, so back to your regularly scheduled programming.