Has anyone written code for a hash table?

The Hash table classes are not part of the standard STL. This causes some difficulty that I think can best be overcome by getting advice from someone who has been down this path.

The hash table library can be gotten from one of three sources:

http://gcc.gnu.org/libstdc++/
http://www.sgi.com/Technology/STL
http://www.boost.org/

But no instruction is given on how to merge the code with the header files I already have.