Simple Lua Binder is an everything-in-one-header (two actually) to make C++ <-> lua bindings easily. It is based on the C++ template mechanism to compile wrappers on the fly to access classes and methods. It is not well documented, that is a task I will do in the near future, by the way SLB lib can be found at http://svn.pplux.com/lab/SLB. Drop me a line if you try to use it and it works (or not), it should work with any C++ compiler (It has been tested on GCC).
Update April 2007: I’m working in a fresh subversion for a complete new version of SLB… it will be released at slb.luaforge.net