One of the new Win7 features in BITS is integration with BranchCache. In short, BranchCache is a new peercaching technology that will allow Win7 clients in a branch office location to cache and distribute downloaded content. This is going to be an exciting new feature in Win7, especially for IT folks.
Here is a plug from the New York Times: http://www.nytimes.com/external/idg/2008/10/28/28idg-10-best-feature.html
Also check out this video from TechNet, where Devrim Iyigun talks about BranchCache: http://edge.technet.com/Media/Branch-Cache-in-Windows-7/
Alex Ng [MSFT]