Hacking other games? Getting models from other games/converting them?

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Has anyone had any success with hacking any other games, removing models/textures or other data?

I know this isn't the best place, however, I have no idea if there are any communities that do work on other games, and I knew the success of hacking brawl from the many videos I have been linked with modelswaps.

I'd like to know more about any tools I could use to remove models off of other games and convert them into formats usable in either Brawl or possibly Unreal, Unity, or with XNA.

Edit: Should also note I looked through some FAQs here, they only have to do with importing into brawl, not extracting from brawl/other games.
I also know it's a very difficult process since many games store model data in different formats and with different methods.