There are so many cool ways to record
xbox 360 gameplay. I have 2 ps3 and an xbox elite. o, and a wii and i record from all of them.
you can use virtually anything to record video games.
VHS / VCR recorder - resolution lower than 280p
DVD recorder - 280p to 360p, some go higher
Dazzle DVC 100,
Roxio Game Capture,
EasyCap: 280p
Hauppage HD PVR capture card: 480p - 720p
newelectronx hd pvr: 360p, 480p, 720p
Blackmagic Design Intensity Pro: 1080p
pick your poison according to the quality of the resolution you want to get. that should get you started.