Merging IM accounts

I'd been toying with the idea of collecting all my IM accounts and routing them through an always-on server. Something like bitlbee, with an IM client on one end, not IRC. Jabber is *almost* what I want - I can run a server (e.g. Openfire) at home just fine, and it supports all transports. The donwside is, though, than I cannot use multiple transports of the same type on one jabber account, e.g. have two MSN or AIM accounts linked to my jabber login. It will also disconnect me when I close my client. So back to good ok' bitlbee it is, I guess.