I bought this camera brand new in 2006 but I no longer use it as I have a modded 450D and a 550D.
It comes in the original box with CDs, cables, and manuals (may or may not ALL be there).
I've added a dual battery grip which has integrated timelapse, long exposure, and timer functions (that I never learned how to use properly), also an EOS T-ring 2" adapter with 1.25" extension tube, and two 2gb CF cards.
I'll also throw in the 'kit' lens, 18-55mm wide angle which is fine for learning nightscape photography.
I believe it's compatible with Backyard EOS and AstroPhotographyTool, although I've never used this camera for AP. It's a good, cheap starting point for anyone looking at getting into AP, with everything to get started.