I can't recall the url, or which thread it was in, but there's a website called something like "WhatShouldIReadNext" which comes up with various ideas based on you telling them a book you liked.
in fact, a quick google suggests it is actually called WhatShouldIReadNext, and can be found here:
http://www.whatshouldireadnext.com/search
However, it doesn't seem to deal gracefully with books it doesn't have in its database - it was giving me an Internal Server error...