List of new stuff in BITS for Windows 7 

• Peer caching now uses Windows BranchCache. This new peer caching model replaces the model used for BITS version 3.0. For more information, see Peer Caching.
• Added a more flexible resource access model that allows applications to associate a pair of security tokens to a BITS transfer job. For more information, see Helper tokens for BITS transfer jobs.
• Added the BITS Compact Server, which is a stand-alone HTTP/HTTPS file server that provides the ability to transfer a limited number of large files asynchronously between computers.
• Added more granular bandwidth throttling. For more information, see Group Policies.

You can visit http://msdn.microsoft.com/en-us/library/aa363167(VS.85).aspx for more.

 Kapil Mathur [MSFT]