Plenty of great videos out there, as mentioned. I am a huge advocate of the Scott Kelby and Matt Kloskowski book "Lightroom x For Digital Photographers" (there's a version for 3, 4 & 5). It does a great job of explaining the ins and outs of each section of the program. I believe the videos will get you working faster, but it's a nice reference to have. Matt also did a terrific video series for NAPP, but you need to be a member to access it and unless you're looking to dive head first into Photoshop as well it's not worth the price of admission given the free tutorials out there.