Using Google's V8 JavaScript Engine with MongoDB
Purely geeky: learn how to use the Google V8 JavaScript engine with MongoDB.
Currently the JavaScript engine used is spider monkey (Developed by Mozilla). If you checkout the lastest version of mongoDB you will be able to build it with Google’s V8 JavaScript engine support.
The installation details are for Ubuntu, but who knows maybe somebody can get this to work on Mac OS too.
via: http://www.howsthe.com/blog/2010/feb/22/mongodb-and-v8/