Rob Caron has put together a wonderful comparison chart between ALL the various versions of Visual Studio 2008. Everything from the Express Editions to Team Suite. And he breaks it down into specific features. I highly recommend taking a look if you’re trying to determine which version is right for you.
By the way, I was surprised to see there were some features available in Express Editions that were not available in Team Suite! (But I think they’re features that are replaced by better features in Team Suite.)
Check it out: Visual Studio 2008 Product Edition Comparison