Finally, a good topic to put in my two cents.. :-)
Honestly, I am VERY impressed with Ubuntu linux. Just about a week or so ago 7.10 came out, and when I tried the live boot, wireless worked! Everything I threw at it, it did VERY swiftly. This was on a PC with a 2.4ghz P4. Heck, even if you have 256mb on linux, it takes you a good distance.
I was thinking the same thing as far as what the primary OS will be. Mac OS X is becoming more favorable and I notice alot of people having a mac laptop in my college. Vista im not too impressed with. Not because it just came out and lack of things, but the fact that it is "usable" in a system with a dual core 3800+ and 2gb of ram! :-?
My prediction is that Microsoft OS will start to decline, and either Mac OS or Linux will eventually take. Maybe not 10 years from now, but later. :-D :-)
You should look at Cedega for linux if you want to play PC games. Its not freeware, but it does one heck of a job for playing games. It even does world of warcraft! :lol:
Either way, if you do web surfing, messaging, and a few games, then Ubuntu would be a great choice.
btw, show your friend Ubuntu lol, he will crap when he sees it booting off a CD and how much you can do. :-)