hi,
I'am responsible in my company about migration from 2005 to Vs 2008 ,so i worked study new Features in visual studio 2008 Suit For Architct,Developer , Tester And Team system Features ( work item,Process Template,Automated Build...etc) .
mainly i get started on Application Design and System design , it's amazing features where you can add new applications on you work space and everything will be reflected on projects and vice versa .
from now You add web projects , webservice ..etc and the Application design will created automaticlly for you
also you can use your applications to design systems .
Finally ,Class Diagramming is still the most usful Feature .
thanks in Advance