I'm typing this on a Windows PC. My iMac G5 is arriving on Tuesday or Wednesday.
I'm a product of the halo effect. I've owned four iPods... before I ordered my iMac I was all into the Aqua-emulation craze, and it hasn't slowed down. Try
http://aqua-soft.org for more information.
And Aqua-emulation is getting pretty accurate. There are Finder clones, docks, widget programs, desklet programs, and more, all for Mac emulation. Here's a desktop from my Dell laptop a little while ago:
http://img235.echo.cx/my.php?image=untitled8bd.png
Yes, the dock is missing. I turned it off to make way for Winamp. This is why you see programs at the top of the taskbar. The dock I use, RKLauncher, can minimize to the dock as in OS X.
And yes, there are no left-sided glyphs, but that can be achieved with a program called WindowBlinds. Yes, the desktop icons are too small, but that and placeable/customizable labels can be fixed with a program called AveDesk. Really, us Windows users have pushed ourselves so far that we might as well buy a Mac, which is what I've done. But most are too scared.
Also, there are ways to make the menu bar work, with a program called ObjectBar, and other in-development programs.
The Spotlight bar you see in my screenshot searches Google. It's a Konfabulator widget that resides in the top left corner of the screen, over top of the icon in the visual style. When you click it, the Spotlight bar appears, as in OS X. Search matches are displayed in a pinstripe dialog box below it, just like in Tiger.
Also, that site - so many people use that system pack. You can install and remove anything you wish, pick and choose, and it does a lot of things. It installs the Flurry screensaver, changes system icons, installs visual styles, installs official OSX sounds (such as the startup gong), among other things.
Enjoy laughing to yourselves.