Simply FYI: I just downloaded yahoo's messenger rpm 0.93.0, converted it with alien to a deb, inspected it's contents, and installed the deb file. The distribution only contains a copyright and a /usr/local/bin/ymessenger binary file. After installation, the program works, and provides a nice alternative to the yahoo java messenger (which I can't get to work with mozilla.)
I found a recent posting that indicated difficulty getting everybuddy and yahoo to play nicely. Admittedly, I haven't tried everybuddy, so I don't know how it compares. Interestingly enough, the file was compiled on a host called linuxbad.corp.yahoo.com - I wonder what they mean by 'linuxbad'? Aaron