Aloha JC,
I agree the technology is pretty cool. It's called "scraping" and as Mike said in his post, it is done by a web-crawling robot or spider.
I do not mean to rain on your parade, but the technology has been around for a few years now, and there are dozens of competing sites. I think the sun has set on this opportunity.
The big boy on the block is
www.Froogle.com. From the boys at Google.
Aloha,
Jason