What the crap?
OK Ashlee, you may want to check the controls on the DeLorean and try again, looks like you had them set for 1997 instead of 2007.
I've been using Linux as my preferred desktop OS since 2002 and had used it on the desktop in a previous employment since 2000. It took several attempts to get there, I'd given it a whirl as far back as 1998 and at the time I couldn't work out why in the world anyone would want to use it.
Within 3 or so years of my first try, it had reached a tipping point where it actually *could* do everything I wanted, using all the hardware I currently owned or planned to buy, without any major reliability issues. At which point I sidelined Windows (and nuked it entirely when I realized I hadn't booted into it once in 6 months). Now I use Windows in work and hate every second of it (yesterday XP decided to arbitrarily change my desktop theme back to the default settings; this is better than Linux *how*, exactly?), and wonder why in the world anyone would *choose* to use it for anything besides playing really expensive games.
The Linux desktop, drivers, applications, and overall quality have only improved since then, to the point where I'm quite confident my tech-unsavvy mother could use it if I did the install for her, or it came pre-installed on the system like Windows does (she couldn't install Windows herself, either).
Limited driver support? No problems here any time recently, from what I've seen and heard I'd have a harder time getting working drivers for Vista. Even wireless LAN card support, the bane of Linux users everywhere, is getting there (my 54b/g card works straight out of the box with the drivers in Ubuntu). If Grandma just plugs her desktop box into the cable modem, odds are near 100% that it will Just Work and won't be pWn3D LoLZ!!!!1!!one!!! inside 5 minutes either.
Multimedia? I wouldn't call it limited, though it doesn't help that you have to separately install the relevant packages. Easy enough in Ubuntu, but off-putting to a newbie I'm sure. Then again, now that I have it set up properly, I find multimedia gives me more constant low-order grief in Windows, and Banshee is far better for managing my iPod than iTunes is (oh how I love to hear my wife yell at iTunes for being stupid and slow...)
Power management? Oh, yes, it used to suck raw eggs, but since upgrading to Ubuntu Feisty, I now have a laptop which will hibernate just fine. It may even have worked before, I just hadn't tried it. By comparison my wife's XP laptop loses the plot after about 3 hibernate/awaken cycles, hardly dependable.
CPU SpeedStep control has worked since I moved to Ubuntu, ramps the speed down under idle and gives it the bejeezus when the CPU is under load. It really *did* Just Work, without my intervention to make it so.
Linux is improving all the time, deals like the Dell arrangement, and the recently-announced Lenovo one, can only help improve things yet further. Windows is...well, you got a problem-plagued Vista after a delay that makes even Debian look fleet-footed! Maybe you'll *have* a new version that doesn't suck so badly by 2020...
@ Jamie Carpenter, re: Ubuntu and root: no, you can't log in as root by default. That's intentional, and exactly the same way OS X does it. You log in as yourself and use "sudo <command>", then enter your normal user password, or else "sudo su -", your password and that gets you a root prompt. Apps which require root privileges when launched from the desktop menus (one of which I believe is a root terminal) will prompt for your user password and then run as root. Installs "just work" in Windows because most people will be running with admin privileges at all times. That's a Really Bad Thing when you're using an OS where stuff can be installed without your consent...
Also I tend to find that most normal people are baffled by *any* filesystem and will forget where they saved their files whatever the path looks like. I'd argue that "/home/paul/" is a hell of a lot clearer than "c:\Documents and Settings\Paul\My Documents\" any day of the week though.