In addition to the items I mentioned in my previous Beta 2 - RTM breaking change list, I found a link on the VS 2008 samples page that a whitepaper has been issued on this.
In addition, there is a whitepaper specific to breaking changes between VB 2005 and VB 2008 available here.
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Visual Studio
Crossposted from http://devauthority.com/blogs/jwooley/default.aspx