Not to turn this into a "why Linux isn't main stream" thread. But I see the 2 biggest road blocks for Linux adoption as lack of support for Gaming and MS Office. I know you can run them in wine/VM etc. But an easy installation, at least currently, of Office is needed. So many Schools and businesses require it. Also a lot of people who would love to run exclusive Linux, are also gamers. I had my wife running on Linux, but she would get Office files for her Girl-scout troop and School (she was in college at the time), and didn't want to alter the format by using Open Office. Now I think alternatives to MS Office, like Google Docs and Open Office are becoming much more accepted recently, so maybe that with more gaming support we're almost there! :)
