I don't know the answer to your question, but for future reference (not much help at this point, sorry), try Astro Pro. I use it to keep apps backed up to sd card, and even though they may have to be reinstalled from market, it's my understanding it keeps a list there. I really like it, but there are others out there that do the same thing.
I've seen the app you're looking for described, but can't remember the name. I'm sure some will come along who does.