A .NET 3.5 solution ended up with this warning when compiling with msbuild.
Sometimes NDepend might help out but in this case it didn’t give any further details. Like Bob I ended up having to resort to opening each assembly in ILDASM until I found the one that was referencing an older version of the dependant assembly.
I did try using MSBUILD from VS 2010 Beta 2 (as the Connect article indicated this was fixed in the next version of the CLR) but that didn’t provide any more detail either (maybe fixed post Beta 2)
Is there a better (more automated) approach?