That's good and that's bad. It's bad because it means you'll have to move much faster to get your site out the door. It's good because then that makes your site much more valuable as an acquisition for one of the large search engines that falls behind the leader in this space. Specifically, I would target trying to be acquired by Microsoft, Ask.com, or A9.

Don't be intimidated by Google and Yahoo! as they're both trying to juggle too many balls in the air at the moment to design something that does a great job at dealing with this specific type of web content. If your service is done well, I really don't think you'll have any problem with the acquition.