Who's been a guest at the White House? You can now find out with their handy searchable database. Beyonce's been a guest.And so has George Soros. He was there to visit Larry Summers. (He also visited the Old Executive Office Building for meetings with David Lipton.)Also on the list: George Clooney and Oprah, the JP Morgan CEO, and some union big-wigs. The Michael Moore and Jeremiah Wright that visited weren't the famous people with those names, though.The list isn't comprehensive. Visits to the first or second families that were "purely personal" are omitted and there is a pretty open-ended clause that lets the White House keep "sensitive" visits secret.But this is still a pretty incredible victory for transparency, given where we were two years ago. And it will be hard for any subsequent president to provide any less information now that this bar has been set.Photo from the White House