So I'm rather ashamed to say I've had my Mac for about three weeks and I just now installed a word processor. I used writely quite a bit which is amazing, but I realized it's not a replacement for normal word processing. I'm personally boycotting Microsoft which means using OpenOffice. It's perfect except that it's not obvious how to install it on a Mac. That's a first. Still, it's worth saving the $150 or so from Microsoft Office.
By the way, I just realized that operating systems seem obsessed with the letter X:
Mac OS X
Linux's GUI is called X
Running Unix GUI apps (like OpenOffice) on Mac OSX uses X11