This seems interesting:
http://www.instructables.com/id/Android_G1_Serial_Cable/
I also read some stuff about people working to get USB OTG working; there was this for instance:
http://androidcommunity.com/motorola-droid-gets-usb-host-hack-20100210/
Nice finds. Ill have to set a google alert.
Wish I had the time to play with this stuff...
Yes, I know the feeling 
Cheers
GB