Today I wrote a little command-line tool for helping track down .NET assembly compatibility issues:
My team encounters these problems very regularly -- we have a build/dependency tree that easily rivals Castle Project in complexity, and it gets out of sync easily while waiting for downstream projects to build. Normally, your only option in this situation is to fire up reflector and poke through all your references manually -- a very tedious process.
So, to use this tool, you point it at a directory (e.g. your lib folder) and provide a list of patterns for assemblies you want to check:
Then it'll tell you any that are broken.
Grab it here: libcheck.exe
Update (April 2011): libcheck is on github! Grab the latest version here.