As though I wasn’t busy enough, I find this at NASA Watch (I also heard about it from a friend at Boeing).

White papers are invited that address initial challenges facing Project Constellation and Project Prometheus in general, and the Crew Exploration Vehicle (CEV) in particular. Enclosed are the key focus area, issues, and suggested white paper topics. White papers that examine one or more of the topics are invited. Papers that address other important aspects (in a manner consistent with the information requested below) are also welcome. Viable white papers should be consistent with the January 14, 2004, U.S. Space Exploration Vision, as well as with generally accepted laws of physics. Innovative approaches