A list of websites that provide tools and resources for GMs: Dungeoncrafter (a free mapping tool with some sci-fi tile sets, at http://www.dungeoncrafter.com), links to the galleries of three artists that have contributed material to Action Check (Andreas Maaninka at http://spacefx.cjb.net and Victor Egorov at http://island.atomlink.ru/e_gal.htm, and Dragan Ciric at http://elfwood.lysator.liu.se/lothlorien/d/r/dragan/dragan.html), and Elfwood (an online community for artists).