1. Google V8 Javascript engine. http://code.google.com/p/v8/. Google V8 Javascript engine. http://code.google.com/p/v8/.
2. Matlab. http://www.mathworks.com/products/matlab/. Matlab. http://www.mathworks.com/products/matlab/.
3. Loop-aware optimizations in PyPy's tracing JIT
4. Shape cliques
5. Tracing the meta-level