Hey, just thought I'd add my two cents:
I made "the switch' (as Apple-fanatics call it) April this year. Now I'm not a huge computer buff - I'd say I know of things, rather than about. I was concerend if I'd get used to the Mac environment, or just get annoyed because it didn't work like windows. As many have said before, your adoption to the system depends on any preconceived notions you bring with you.
I'm loving it. I bought a PowerBook as a replacement for my desktop (noteworthy, though, I was going from a PII, 233, so anything would've felt like an upgrade, though I do use PCs at work), and now will probably never consider getting a PC again.
I did go and get a 3-button scrollwheel mouse, but when I was travelling for a month without it, and just using the one button trackpad, I actually started to understand the one-button environment, and hotkeys. It felt natural. I would'nt say it was any easier or more efficient, but there were certainly no problems. A lot of things, like the right-click contextual menus in MacOSX are there, but I found myself not needing them as much as on Windows, since I mostly used them for cut and paste functions (which I now use the equivalent of ctrl-X,c,V etc). Many contextual functions for things on the menu bar and Dock seemed to be also assigned to click-and-hold as well.
There were a few things I missed from the Windows enivronment, though. I missed the open windows along the bottom, so you could always easily click to a particular window at any time. I realise the Dock on Mac operates similarly, but it only has icons for the entire application, and notnecessarily windows within the app. But for the most part it works. Of course, there's Expose, but at first, I felt that it was mostly flashy and only 'good' because it filled a hole in how the environment operated. And it does to an extent. Of course, I find it invaluable now...and it does leave the Dock looking clean. I miss the right click, create .txt (though I'm sure there's something I can do about that, I just haven't looked hard enough). The biggest thing I missed was the way Windows picutre viewer on XP handled jpgs in a folder...with all the options to view them straight from the folder. It was great. Preview for Mac was kinda feeble in comparison, and iPhoto wasn't so great for actually viewing things quickl;y. However, Preview for Tiger has many of the options now, so that point has become all but moot.
As for Virtual PC, I have no idea. I have no need to run any PC applications, so no intention to get it. I mostly use my PB for internet, Office, and some unixy-type programs for work. Office 2004 for Mac is fantastic. So much better than all the Pc versions. It looks, nice, has a lots of neat features that PC versions don't have (I think), and a slightly different layout that makes everything easy to access.
Hardware-wise, it's also great. I've had very few problems hooking up peripherals (and remember, I'm not computer-savvy), including wifi, networking, cameras, external monitors. Msot of the time, it's plug and play business. Having said that, Windows Xp is pretty good with that mostly too. I'm sure drivers are required on Mac, but it's so transparent, I've never had to deal with them, even with an mp3 player that required it's own software (it seemed the application had all it needed to connect - click and drag the app...and...that was it.).
Mac Os has been pretty stable, but again, I don't really run anything too-third party. Office is about as far as I get from Apple. I've had a few bugs where I needed to restart, and a number of application crashes, but nothing was ever as devastating as a compelte system lock down that I routinely experienced on Windows at work (given, they are public Pcs, and who knows what people get up to on them).
My powerbook is very quiet, gets ocassionally warm, but nothing too bad. My PowerBook does seem a little bent, and I'm wary of the latch mechanism, but no major complaints yet.
anywya, after getting one, I've now become a diehard Apple Junkie. But I'm easily brainwashed, so....