How about this: let a user enter a tag (#awesome, #sxswi) and your app trolls the tag's search results on twitter for videos. They get sorted by hotness and presented as a playlist. New things get added to the end.
Obviously my execution is not resonating with people (great signup conversion rates, terrible usage rates), so when I have time I may reboot it as something more like what you're describing.
I still think there is something to the idea of improving the leanback and placeshifting experience for all this great long format web content that's out there (Rev3, This Week In, etc). I'm apparently just not smart enough to figure it out on my own ;p.
Also: if you want to say thanks, just click the tiny triangle pointing up next to my name. That's how we give out happiness around here.