what about having more than just one account on each network?
e.g. i am using 2 different jabber servers, if one is down i can still use the other one.
likewise there might be users who have e.g. 2 icq accounts, one for work, the other for private use.
speaking about work and private use, i'm missing some jabber features, especially setting the resource (you log in from, coupled with a priority).