I sometimes get a hankerin' for programming languages. And I love script-style execution and high speed. I also love fast start-up and low memory consumption. Both of those points are making me more and more shy of the JVM.
So, how do you get your hands on a well-maintained cross-platform JIT? Maybe Nanojit (used by Tamarin and therefore Flash; also used by Firefox 3.5's TraceMonkey) is a good choice. Looks small and fast. Maybe even tasty. Something to keep in mind perhaps.
Tamarin also includes a garbage collector, as a related morsel. Here's hoping it's all thread-safe.
Again, just notes for the future.