what to scrape?

So I've been playing with some code after a long long hiatus from programming and I want to try my hand at writing a spider with the intention of building a database. I see the most retarded databases selling like hot cakes on DP - databases that are nothing more but scraped content from sites like wikipedia, ezinearticles, IMDB, etc... I'm trying to think of a site to crawl & scrape that would at least leave me with something useful in the end, but I'm drawing blanks. Anyone have any ideas? If I end up building something you can bet I'll throw the DB into member downloads Help me think of something!

How about a database of articles sorted by niche? That should sell pretty well. And there are a bunch of open-source libraries that can help you determine which category to fit an article in.