Bonjour Paris is another good resource for American expats. The site was in fact created by an American expat. You can find lots of good articles and information there.
Thanks for the sites you've shared! I visited some and they really have good and well organized infos that would be quite helpful for expats in Paris! It's good to know that there are people out there who are determined to make the transition easier for expats! Keep 'em coming!