Ive got 1004 running (on a spare computer as Core) and then just changing which core is plugged into my switch and using the same machine for my MD.. (i did have to 'fix' something... my MD has a RTL8111 (r8168) NIC so I created the MD in Admin, then installed the r8168 driver in the MD file system) The MD booted up and installed fine (except for the changes noted earlier about the nvidia driver).
Things I know on my setup that I noticed didnt work were : Gyration remote, LCDProcClient (for LCD display), a DVD doesnt display (just a black screen) but the audio is going (but pushing a remote button would 'pop-up' the screen momentarily). Also, I couldnt get MythTV to display video... I'm using a HDPVR (that works using 'cat /dev/video0 >> test.ts') but Myth would just keep trying to start LiveTV over and over until timeout. I didnt investigate too much though... 2 day weekends are not long enough
and there is plenty of yardwork to get done