It's Open Source, based on XML, flexible and wide spread. (currently more than ICQ - believe it or not!). The Client-Server system is decentralised so everything works like the mail structure
. (wich means you can even set up your very own server)
And it also supports basic support to connect to any other protocoll!
don't hesitate and find out about it on www.jabber.org
grab a client (there are many different ones for any OS)
grab a server (public serverlist on www.jabber.org, but you can use jabber.org directly anyway)
and start chatting!!
I'll be glad to answer questions, my jabber ID is : mray@jabber.org
