Andrew Goudelock Bojan Bogdanovic Chandler Parsons Charles Jenkins Chris Wright Cory Joseph Darius Morris David Lighty Demetri McCamey Demonte Harper Donatas Motiejunas Gary Flowers Iman Shumpert Jerai Grant Jeremy Tyler Jimmer Fredette Jimmy Butler Joffrey Lauvergne Jordan Hamilton Josh Selby Kevin Anderson Malcolm Thomas Marcus Morris Markieff Morris Nikola Vucevic Nolan Smith Scotty Hopson Shelvin Mack Tobias Harris Travis Leslie Trey Thompkins Tristan Thompson Tyler Honeycutt Xavi Rabaseda http://www.nbadraft.net/2011-nba-draft-workout-master-list
The Rockets usually work out a lot more players than that. Could be names that didn't wind up on the list, or Morey certainly attended other workouts to watch, say, Biyombo and Valuncianas and etc etc.
Oh I doubt it's a complete list since Houston does not release an official list to the media. There are certainly a few players that i cannot believe we haven't worked out: Singleton and Klay Thompson come to mind immediately.