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Newgrounds
Here is a long time popular site in which you can find loads of humorus Flash movies/games. And they added an audio section as well.
http://www.newgrounds.com/

Photo2Text (browser)
Upload an image and convert that image into text using the submit button
http://www.photo2text.com/

PikiPimp
Change the entire look of your family and friends by adding hair, hats, clothing, bodies, etc.
http://www.pikipimp.com/

Verbotomy
Similar to Sniglets, you have to try to make up a word for a definition.
http://www.verbotomy.com/

Zingfu
Make silly posters or magazine covers of your family and freinds
http://www.zingfu.com/