Last week or so, MR posted Tyler Cowen's 10 most influential books, and I think lists like these are very important for students like myself to look at and read, or even reread some (but not Fountainhead or Atlas Shrugged, sorry). Here are some more influential book lists from various blogs:
10 books and another list of ten influential books from EconoSpeak
Bryan Caplan's list and Arnold Kling's list from econlog
Econjeff's book list
Hopefully Greg Mankiw, Brad Delong, and some of the bloggers at Angrybearblog or other blogs (maybe Krugman too?) will post their lists as well.