TiVo's added YouTube support to their Series 3 DVRs. So how does it work?
Short answer, horribly.
The user interface is a bit clunky, but overall works. But when you get to the videos, finally, the audio skips. (On every one I tried.)
And the video quality is horrible, but then again, it's YouTube. I was expecting YouTube quality video and that's what I got. I was also expecting YouTube quality audio, but it managed to fail to deliver on that.
All-in-all, not a very effective way to visit YouTube. My PS3 does a much better job.