I got one, I use it for the days I dont want to use up projector time to game on my 360, or Im in too much pain to play in the living room, bring it here to my desk and play on my pc monitor. Its actually pretty nice, but I paid about $10 shipped off line for it. Looking forward to doing gaming on my LCD monitor I plan on buying so it will be in wide screen like on my PJ. 22" 4:3 monitor is nice, but in widescreen games, the bars are annoying, and the screen is smaller because of it. Some games will play in 4:3 mode when the 360 is selected at 1280x1024, highest 4:3 screen you can select in the menu, but for the most part the games I have it does wide screen at 4:3, and those suck to try to play.
EDIT
I looked that cable up some more and they make a VGA, the one I got, and HDMI. I dont have the HDMI one, just the VGA one to use on my pc monitor.