i had to do a rebuild of a customers computer, and they decided they wanted to try a dual boot with ubuntu and vista. everything was setup nicely for them, i gave them a quick tutorial of ubuntu and said goodbye.
7 months later i got a call from them telling me that the computer would not power on. sure enough, the power supply had died. i replaced the power supply and all was well. i booted into ubuntu to make sure it was still running OK. all was well. i then asked my customer how windows was running. their reply: "we don't know, we never use it." WOW. they said ubuntu does everything they need and more. their brand new HP all-in-one printer works beautifully, and so does the mp3 player they bought.
when people say that linux isn't ready for the masses, people like my customers prove that it is ready.
btw, i also have about 6 other customers that are very happy with their ubuntu installations. :p