Hello, I'm happy to announce that Boost.Flyweight has been just commited to the SVN trunk, far too many months later than initially planned (but better later than never). The goal is to have the lib included in Boost 1.38, if its stability and the release manager permit. If you're interested in the Boost.Flyweight please update your SVN copy, play with the lib and report your comments/complaints. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo