Jb Evain check his Cecil library into the Mono SVN repository (module name `cecil').
Cecil is a library that can be used to consume and produce CIL libraries. We are planning on using it for writing a "diet" program that will act as a "garbage collector" for assemblies (Paolo has written one already with the low-level C interface), allowing developers to create arbitrary profiles of the Mono class libraries given a starting root set. This will be handy addition to our bundles
In addition to that, there are various other things that we have in mind for Cecil: writing a new verifier, writing a bug-finder, writing a CLS and style compliance tool (like FxCop) and Jb's own work on his Aspect weaver.