This is sort of cheating, 'cause the Mac is (obviously) not mine, but it's the only one I've had the pleasure of using on a semi-regular basis (ie. once in a while).

iBook 400 (I think), 12" (from 2001 or so I think)
18.6 GB hard drive (well, that's what it says... probably 20 GB?)
256 MB RAM
Runs 10.3, not super-fast, but usable (for her needs)

I don't know about video memory or anything like that... I think everything in it is completely stock...