fact:
your memory card wont fit in the go, the Go uses a memory stick micro, where as the older units used a pro duo.
heresay:
I have not confirmed this, ( I have a GO but only like 2 hrs on it) Sony states that all umd games or previous downloaded games can be transfered to the GO using the PSP go media program that comes with the go. (I dont think I even installed this software)
hope that helps. as the GO is very new, there is not alot of info for it. I try to only state facts that I know, or atleast warn you that what I have stated is hearsay.