Are there related or complementary efforts?
There are two complementary projects worth mentioning. The first is NetEc. This is an ambitious all volunteer project to track all economics related material on the internet, and has introduced a number of innovations, including the automatic indexing of working paper series. NetEc differs from NAJEcon in that attempts to document all material, regardless of quality or interest. Incidentally, while NetEc provides search facilities, all NetEc material is also indexed by the major search engines, such as google. The second project is NEC ResearchIndex which is provided for free by a commercial organization. It is a greatly improved version of citation indices such as the Social Science Citation Index, which indexes both published material and material found on the internet, and can often provide the actual text in which a reference occurs. As an alternative model to NAJEcon, but in a similar spirit, is the faculty of 1000 in biology.
