japanese stuff    
Japanese Humor
Japanese English
Japanese Jokes
Funny Books
Comedy Movies
Funny Japan Sites
Funny Japanese Sites
Its just a starter list, but plan to have a bunch of these:
Origami Boulder - Great deal on your own Origami Boulder
Japanese Ice Cream - How can you resist such yummy flavors as raw horse flesh ice cream
All your Base Belong to Us - One of the classics in funny Japanese English in this animation
Sushi Fortune Telling - Choose some sushi and get your fortune based on your choices
Ninja Burger - Burgers on time or the deliverer will commit seppuku. Has a funnly little flash game as well.