Im running Ubuntu on my fileserver at the moment, it was a pleasure to install. On my workstation I am going to run XP and Ubuntu, dual boot (XP for Word, Photoshop, Flash and Dreamweaver). Currently on Vista and I am not going to miss it.
Choice is good but I think it is positive to have one big mainstream Linux and not call it Linux in the name. I hate that f"n penguin :-)