mtgox: http://bitcoinity.org/markets?exchange=mtgox (a bit laggy while their API is still not fully functional)
tradehill: http://bitcoinity.org/markets?exchange=tradehill

I just wanted to create some thread to collect feedback.
Ideas or problem reports are welcome.

Basically I just created it to have some live ticker on my unused 15" LCD (so it's kinda optimized for 1024x768 full screen), but since some poeple started using it, I'm developing it a bit more. More features coming soon.