Well on an acdemic discount at least. So I had this beta version of office 2007 sometime ago and used it on some class projects. In my opinion the best feature of this product is the ability to solve a great mystery to me: the use of color. I've tried for many years to learn these secrets but every time I try to come up with my own coloring scheme the results are disasterous; I end up making my work look like it's for easter (too pastelly) or holloween (just plain scary).
Office 2007 has some features that allow you to apply a "theme" to your documents. Themes are these cohesive and harmonic styles, treatments and colors that can be easily integrated into your document. I made stuff like this:

and graphs like this:


The user interaction techniques used in office 07 are pretty fresh. Instead of a toolbar, they now use what they call a "ribbon" which changes depending on what you are doing. I was pretty impressed and was able to quickly adapt. The only problem is that my beta version ran out sometime ago and I have to use some ol' crusty Visio version from 19-diggity5 or Illustrator which doesn't have a connector tool that I can figure out. That's ok for now, I have two of my own "themes". Easter is over soooo...