My favourite web site by a long shot is InThinking - it is absolute pure gold for IB Psychology and I don't think I could do this course as a new teacher without it!
I also like Quizlet for glossary revision although it is perhaps starting to be overused by a lot of teachers.
The website nobelprize.org is one some may not know about. It has some good animated games. Students think they know about hemispheric specialisation until they play the game. They learn a lot about Sperry's work.