I'm not sure if there are any 3rd Party cables available yet. The old 3rd party cables do not work, regardless if they hook up to the dock connector or not, since apple has added the authentication circuitry to the new cables. If the iphone/touch does not ask you if you want to "display on tv" when you try to play a video, the cable will probably not work.
I purchased the composite cables and the video looks pretty good on the television. Ripped movies with handbrake, using the iPod "High-res" preset look great.
dang, it'd be great if someone came up with a hack to deactivate the stupid authentication...