Where can you find an index of B-horror movies, obscure ones?

I know IMDB has an extensive index of movies and amazon has a big list or whatever but that doesnt help me. i need a list of B movies that have been released up until now, stuff old and new. like for example, there was Peter Benchley's Creature which was about a half man half shark. i consider that B movie. it was released a few years ago but unless u know it by name, its hard to find out about it. Also, movies like Carnosaur or DNA about a predator-like monster...more recently, stuff like Cerberus or Attack of the Sabretooth...Komodo and King Cobra, those types of movies...is there like a database on the web, maybe a b movie database, that would list films like this that arent really mainstream?