If you've got some time to kill and are a big movie geek like me, may I suggest you check out this list of the top 100 movie villains of all time.
To me, this list is cool for a couple different reasons.  First off, it brings back some of the best baddies in my personal movie history...some of which may have escaped my memory.  I always love those "oh yeah, I forgot that guy, he's a great villain" type of moments.  Another reason I dig this list, and others like it, is that it reminds me of some great flicks that I've always wanted to see, but haven't...or films I never knew existed, but will definitely check out.  It also includes some characters that may not generally be thought of as villains, but they make a pretty convincing argument for most of them.

It way take you a while to get through the whole list...but I think it's worth it.  Follow THIS LINK to start at #100.