ValveTime.net has details purportedly found during a security lapse in Jira, Valve's internal project tracking software, which shows discussion groups for about every project associated with Valve since its inception and more, but this is all courtesy of an anonymous source, so we shouldn't rule out an elaborate hoax. The site offers speculation about the significance of these entries and whether it means they are in active development or not, but the inclusion of groups for games from other developers makes it hard to draw such conclusions. They found one or more groups pertaining to wish list items like Half-Life 3, Return to Ravenholm, Episode 3/Episode 3 Movie, Left 4 Dead 3, and Source 2; unannounced projects like Cries Unheard, Microbe Wars, and The Grange; other developers' games like Skyrim, Battlefield 3, and Company of Heroes; and even something called SteamMMO/SteamMMO Core. They have posted the data they received on this on Pastebin. Thanks PC Gamer.