Back with the Visual Studio 2005 editions, it was vague at best to which versions had which features.  Well, when Visual Studio 2008 came out, I never bothered with the comparison between the different versions of this latest release.  Today, I took a look and found a very informative document and what is included with the different versions.  If you are considering upgrading to Visual Studio 2008, you might give this document a view, it could be very helpful!

http://www.microsoft.com/downloads/details.aspx?FamilyID=727bcfb0-b575-47ab-9fd8-4ee067bb3a37&DisplayLang=en