I thought you might be interested in Peace Corps Encore! It's a new organization with RPCVs on the board (though unafilliated with the Peace Corps) that works much like an international volunteer temp agency.
Encore! links skilled RPCVs in many stages of life (pre- and post-professional) with needy people and organizations in developing countries and finds the funding to make it all happen. Anyway, I thought it was neat enough to post on the FOG website. Check out the following, if you're interested:
-Nathan Whiteside, FOG webmaster