Originally posted by: tribbles
I guess you're talking about the dictionary here:
http://65.181.138.200/images/osx.png
Yeah, it's certainly useful. Just press F12 or flick your mouse into an assigned corner and the dictionary (and whatever other widgets you choose) fly onto the screen. It's certainly a lot snazzier and more useful than Windows Sidebar.
But I would find it rather humorous if somebody switched operating systems just for OS X's dictionary widget.
That said, OS X has become my primary day-to-day OS not because Windows XP isn't capable, but because OS X allows me to be more productive. I simply get more stuff done in less time on a Mac. It doesn't hurt that most of the applications (including commerical third-party and even freeware apps) feel more refined than their Windows counterparts.
These days, Apple doesn't sell a Mac that can't run Windows, too. The screenshot above shows my Mac Pro, which can also boot Windows XP or Linux. Once BootCamp does its thing (a few seconds at startup), Windows runs at native speed. I don't have a Windows-specific workstation at home right now because I haven't needed one, though I'm thinking about building another just for kicks.
The only way to know if you need or want a Mac is to spend the better part of an afternoon in an Apple retail store, not merely playing with the machines but really experimenting and digging into the OS. There is far more power in OS X than meets the eye, which partly explains why the Slashdot crowd went from being "The Linux Junkies" to being "The Linux and OS X Junkies."
Good luck with whatever you choose.