The molecule thingie is not a scam. I used to work in a biology research center, on protein molecules, and we were using a similar database that the one being built by the UD agent.
You can also find more info by reading this thread on slashdot:
http://slashdot.org/article.pl?sid=04/12/3...tid=136&tid=137
Basically, just to say it's not a scam, it's really useful (it won't find any cure by itself, but more likely help researchers to recognize a pattern), and doesn't do any harm to your computer...