I prefer PCs. However, I've been playing around on a Mac all day, and I will admit that the icons and interface are pretty damn cool. They're slicker.
The PC next to me has Microsoft Office 2007, the one where you can drag and drop and customize your toolbars. It is also pretty cool. The buttons seem somehow softer and a little more hip. But they somehow still aren't as cool as all the little Mac buttons.
So for some psychological reason, things like the to-be-funded-and-created Encyclopedia of Life and the Visual Dictionary look really cool playing on the Mac. Either that or I'm too easily wowed by mosaic-looking collages.
Yup, I'm bored at work.