I've been using Office 2007 at work for quite a while now and I still have trouble finding things in the ribbon. But once I put all my most used commands into the quick access toolbar it wasn't too bad - I only need to go to the ribbon occasionally instead of all the time.
As I've said on other forums: if the first thing I have to do to make the ribbon useful is put all the stuff I use frequently onto the quick access toolbar, then there's something wrong with the ribbon as a user interface.
There are a few features in Excel 2007 that I like. One that I've been wanting for many years is autofiltering on "Contains" rather than just "Begins With" or "Ends With". Also, the new COUNTIFS and SUMIFS functions are useful. But that's about all. I don't use Word as much, and I haven't seen many differences; certainly not enough to offset the pain of learning the new interface.
At home I use Office 2000, and there's very little I can do with 2007 that I can't do with 2000. I can even handle version 2007 file formats thanks to the compatibility pack. I'm not planning on buying a new version of Office for the home in the forseeable future, especially since I'd need the Professional version to get Publisher etc (which I do use), and that's the best part of $1000.
Oh, the article? Yeah, pretty good, but I think I'll wait for version 3 before I buy it.