Halp!
Preamble
Last night I decided I wanted to try Moblin on my Eee-PC. I didn't want to install it over #! though, so I wanted to run it from an SD card. Anyway, the way I tried it first failed to work, and my computer complained about not having anything to run. Whatever. I restarted.
The problem
I got to the login window no problem, entered my details and #! loaded up - a little. My wallpaper was there and my cursor was able to move around but nothing else. No OB Menu, no Alt+F2 or Alf+F3 menu. After a little while I noticed that ADeskbar had loaded too, so I was able to launch X-Chat and get some help from the forums.
I added Terminator into ADeskbar, launched that and then ran openbox. Worked fine. I also launched tint2 and basically seem to have everything running correctly at this point. The autorun.sh file seems in good order. Processes like Dropbox and Nitrogen are being started.
What I think is wrong
After much experimentation, it seems that the problem is with GDM not calling openbox-session, even when I explicitly ask it to at login. Please bear in mind that I am running right up against the limitations of my Linux knowledge here. I would appreciate any help, but would especially value someone to give me the answer in plain English and explain a little about what's going on. 
I kept the xchat log from last night with lost more detail about what I tried if that helps.
Thanks! 