I have been watching with interest the development of LLVM for quite a long time.
For quite some time, work has been taking place on Shark to provide LLVM based JIT for IcedTea.
Now I read that Mono has an alternate LLVM based JIT.
This is excellent news. The more users LLVM has, the faster it will mature, and Mono and IcedTea are both pretty important users.
All we need now it to bring Mono and IcedTea (or OpenJDK) even closer together by working towards a unified bytecode for a unified VM capable of running and mixing java and .net code natively.