Anyone know any good Open Source word processor?

eeehhhh Pages is alright, it's more suited to desktop publishing.

I use gulp MS Office on a student license. The Mac version is far better than the Windows one, although I'm dreading Office 2008.

Although if you're writing long documents use LaTeX...

http://www.tug.org/mactex/

Takes a while to get used to but very powerful.

+1, stick it through TextMate and it's a monster. It isn't for everyone, though. But I got into it just by writing letters, and it looks a lot better than anything else can produce.