Were you ever annoyed that your IM chat logs were scattered between different IM clients or different computers?
While surfing the web i found a fairly elegant solution by using Google Mail and Google Talk.

Google Talk is using the XMPP/Jabber Protocol which can connect to other networks like ICQ and MSN through transports/gateways.
Unfortunately Google did not install any transports on its servers, so wee have to use the transports of other servers http://www.jabberes.org/servers/

For the initial setup i recommend using the Gajim Jabber Client.
How To: Configuring Gajim for Google Talk
After you connected to your Gtalk, you go to Actions » Discover Service, enter a server from the list. Now you just need to register to the transports of your choice.
ICQ numbers should automatically resolve to nicknames, MSN/Live Messenger addresses however do not ...

Now you can login from anywhere and any jabber/gtalk client, talk to your friends on MSN or ICQ. And since Google Mail can log your Google Talk chats, all of your chat history are in one place.