If you've been on the fence about getting Lightroom 3, you can jump off now and get yourself the full version (either Windows or MAC) for just $149 over at Adorama (shipping is free too!).
But you won't have long to to think about it because it's a one day sale that ends at midnight tonight (September 1st), so time is (very) limited.
Below is a video from Terry White, Lightroom teacher extraordinaire, in it he shares his five favorite things in Lightroom 3.
Another Lightroom learning resource is from the kind folks at NAPP, they have put together their very thorough (full of videos & links) Lightroom 3 learning center.