I've always liked mIRC. There are decent scripts for it, and it isn't very hard to customize for yourself. I also use Xchat on Debian ... haven't gotten used to it, but it's working great. Plugins aren't very plentiful though.
Oh yeah, hydrairc looks sweet. I might give it out a try. If it wasn't for my huge mIRC log files that have been around for years, I'd might be convince to leave mIRC altogether.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS