Proud Ubuntu user here. Ubuntu 12.04 is not bad at all. Supports the fancy font he used on his blog. Flash is working. WebGL is working. LibreOffice opens Word docs when I need to. Audio is working.

I have Windows 7 on the other partition mainly to play games.

There was a minor issue with Ubuntu trying to melt the CPU in my laptop the other day, but its not so bad since I upgraded, and I found this powertop thing that also helps.