I've never personally had the need for anything like that. I use GAIM for all of my IMing needs, although it goes through the internet.
I recommend taking a look at sourceforge.net. It's all open source stuff over there, and sometimes you can come across some good programs.
I ran a search, and found this as one of the results:
http://sourceforge.net/projects/newpopper
It might be worth looking at, although I've never used it.
Good luck,
David
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