Messenger Plus Live!

I haven't tried it yet, but I've been recommended this (non Microsoft) extension to MSN Messenger.  Looks like you can program it to expand short text snippets, so maybe it will help eliminate such tragedies as "lol" and "lmao".  I can hope.  Apparently it can do tabbed windows as well, for when you've got multiple conversations going on (surely nobody does that!).