Breaking the Word Processor Curve is a piece arguing that OpenOffice.org Writer is a superior word processor to Microsoft Word. I tried it out and didn’t get the same impression. Aside from everything else, Writer doesn’t support revision tracking, the killer feature in Word that is required for collaboration with other people. I don’t think any open source word processor can claim to replace Word until it has support for revisions, preferably in a Word-compatible way.
Update: apparently Writer does, in fact, have change tracking.