To be fair, there's more to compatiblity than just using the same app. I've seen Word documents that haven't come across from one computer to another because the two computers don't have the same fonts installed. So, complaining about fonts is a completely different issue.
I usually use iWork Pages for my word processing. Most of the time that I need to share a document, I use PDFs. On the rare occasion that I need to share with someone in an editable format, I will use Word.
Now, all of that said, I'm not trying to say that I'm the norm, simply trying to suggest that iWork isn't so completely incompatible with a work environment as some of the proclamations here would make it seem. It really only depends on what the people in charge of the standards for a given company decides to use.
which is very true, but then why pay for a crippled product?
for cross platform stuff and better compatibility just use Open Office.
Its better than iWork (on Win or Mac) in every way and its free.