Nintendo has a nifty little gadget they use at demos and tradeshows that lets you hookup a TV to the motherboard of a DS. That's what allows them to make TV captures (it'd be nice if they made a consumer version for [me]). The DS trailers I got came from the promo DVDs and press kits, so I just compressed them for internet sharing.
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I like Fileshack (fileplanet and everyone else makes me sick). The site is easy on the eyes, the servers are reliable, and the staff there are really nice and receptive of my submissions -- they personally email me every time they accept something OR when they apologize for taking a long time to host things.
If you want a complete listing of my Fileshack uploads, visit my site [WINK].