Ruby has been around for a while now so I was wondering if there was any work being done on a compiler for it? I know that compiler design is hindered by things like Eval() so I would not expect implementations to be 100 percent accurate? My own searches have turned up sparse results.
MacRuby offers Ahead-of-Time Compilation as of v0.5. It uses LLVM to compile binaries that will run on the Objective-C runtime.