Author Douglas Rushkoff gets frustrated with Windows Vista, installs Ubuntu and loves it. I felt like quoting this entire post but I'll restrain myself.

Yes, I'm working on it right now, and it makes even the Mac OS seem like a forest of unnecessary gizmos. Linux is blazingly fast compared with Microsoft's OS, utterly simple, complete with any application you can imagine and – more amazingly – based on an entirely different philosophy than Windows. There's a spirit of abundance and transparency in this Linux universe. Need something, and you just grab it. Pay, if you like, what you like, when you've determined its of value to you.