As it happens, I just installed Ubuntu 7.10 on a new machine at work and noticed the raft of ham radio applications that are available with this distro. I look forward to the day that phaseIV_beacon_demodulator is among them!
Soundmodem which is a soundcard modem for both 1200 afsk and 9600 fsk is now user-space and available in the deb/ubuntu repositories. Soundmodem and Xastir will let you work APRS in linux without buying a TNC. MixW will also run under Wine.
In Ubuntu, there is ao40tlmview and modemp3d already under the Amatuer Radio section in Synaptic Package Manager.
I just upgraded to 7.10 myself and having problems with WSJT and segmentation errors (core dumps). Just another thing to have fun figureing out before the ARRL EME weekend this month.
James W8ISS