There is a really sweet (but unfinished) addon called Duct Tape. It scans BG chat for keywords that you (are supposed to be able to ) specify and filters out the rest of the crap. Right now the issue is that the slash commands for adding keywords to the filter does not work for any other BG than WSG.

The author created the addon and then stopped playing wow... on top of that he said that no one can copy or duplicate the addon... but he doesn't say it can't be fixed to actually work. I suppose it would not hurt to ask if anyone here is interested in checking this out and seeing why it does not work? You could save me some 3 hour bans!

Anyway, here is the link.

http://www.wowinterface.com/download...Tape.html#info