Here are some sites that have fun Lost quizzes. Thought I'd share them:

http://www.funtrivia.com/quizzes/television/television_l-p/lost.html
(has 136 quizzes on Lost-awesome site if you like trivia)

http://www.allthetests.com/fantest.php3?katb=141U
http://www.seabreezecomputers.com/lost/
(this one tells you which Lost character you are...I'm Boone and then Locke and then Sayid - apparently it goes by personality and not gender!)