Ubuntu is a really good OS imo. I run dual boot with Windows 7 and Ubuntu, and it is usually really easy on system resources so people that are lacking in that usually find it a breath of fresh air. The only problem is that as far as I remember, steam and steam games can't run in without an emulator such as wine. However, I thought there was some sort of project valve was working on, trying to port steam to linux. I'll have to check later if anything came of that :p