Ive been a long time VLC Player but recently switched to the Miro player (a spin off of VLC). Its a pretty smooth player in all honesty and allows you to also convert videos into a variety of formats including Ogg Theora and Vorbis. So if your planning of producing HTML5 video this player will come in handy for you.

Unity is a new interface that makes its debut in Ubuntu 10.10 Netbook Edition. It is designed for highly mobile computing with larger icons and a more touch-intuitive interface. Im a big Ubuntu user thos this this this is pretty cool for Ubuntu's great operating system and takes it to the next level. Now all I need is a tablet device or touch screen laptop!

Here is a demo I pulled off blip tvs site