The following libraries by Jiri Soukup are quite interesting and could stir up some ideas for phobos. Data Object Library http://www.codefarms.com/dolclasses Persistent Pointer Factory http://www.codefarms.com/ppf Pattern Template Library http://www.codefarms.com/ptl Tutorial for the C++ version http://www.codefarms.com/docs/incode/ctutor.htm