What modernizer scripts exist for the new ECMAScript 5 functions?

Question

ECMAScript 5 has quite a few nice additions. John Resig has a good overview here. Here is a good ECMAScript 5 compatibility table.

A lot of this stuff can be \"fake

Answer 1

es5-shim http://github.com/kriskowal/es5-shim/

This was part of the narwhal stand-alone javascript environment, but has been broken out on its own. It's pretty darn mature and precise.