Here is one with information on the many behaviours encountered by cat-parents

http://www.petplace.com/cats/guide-to-behavior-problems-in-cats/page1.aspx

I go to that site alot marketa, it really is useful. But now that you´ve posted it I can remember to put it in favourites. Thanks!

This site isn´t really about behaviour problems, but it has useful advice on how to keep your indoor cat from developing any:
http://www.vet.ohio-state.edu/indoorcat

http://www.for-the-love-of-cats.com/index.html

Great site marketa, I have it bookmarked already!