Numba
I came across the Numba project recently (H/T @mza), which looks interesting indeed. From the front page:
Numba is a NumPy aware optimizing compiler for Python. It uses the remarkable LLVM compiler infrastructure to compile Python byte-code to machine code especially for use in the NumPy run-time and SciPy modules.
I look forward to trying it out in the future and also seeing how it compares to Theano