I was in a colleague's office the other day and ran into the now ubiquitous issue that people still buy or install the "Architect Edition" thinking it has everything.  Although this was true in previous versions of VS, this changed with VSTS 2005 when role based editions came into being.  If you need the box that has everything, you need the Team Suite edition.  The Architect and Developer editions are now siblings rather than parent child (since I call myself a dev makes me feel better :)).  For a more detailed breakdown of what features are in what box check out this link:

 http://msdn.microsoft.com/en-us/vsts2008/products/bb933734.aspx

 Cheers,

John