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I agree, Source Film Maker is awesome!

I did a roundup of tools for realtime 3D content creation on the same blog a week or so ago, and talked about it there.

Personally my favourite SFM film is this adaption of the "Robot Hell" song from Futurama:

This medium works pretty well for comedy, are there sites/channels for such stuff ?

The obvious places to start would be the Saxxy Awards for Source Filmmaker[1] and the sub-reddit for SFM[2]. Either of them have tons of good stuff.