Most of us probably know that there are a few Instant Messaging networks competing for users. Because of this, IMming libraries might be best served by being available via all of them (as to not alienate any potential users).
Many people that find IM to be a killer app use Trillian to connect to all the major networks at the same time.
IM junkies know that If there’s no client available on a machine, there are web-based versions of the major IM networks:
Chances are that your patrons using these tools in your library. Maybe even as.you.speak! Anywho, now there’s a web-based Trillian like IM program that will let IMmers connect with 4 networks simultaneously. It is called meebo. It is in alpha right now, and many people are trying it out, so it is a bit slow.
I bring your attention to meebo because it might come in handy for you personally, or it might enable you to try out an IM program in your library if your IT department has the IM ports blocked.