Here is a list of Lightroom 2 features, and here you'll find the Lightroom 2 Learning Center. There are more resources than you can shake a mouse at, and though (some) are not free you can use it for as little as $17 a month. So for less than $20 you'll have a full month to learn Lightroom 2 (and everything else in their extensive learning library). Compared to the DVD's that are out there (costing $59-$99) this is a real steal. Still Not sure? Then you shoul take a free test ride.
Terry White has put together 2 nice videos, each about 25 minutes, the first is an overview of Lightroom 2, and in the second Terry shows you the basics of using Lightroom 2 for portrait retouching.
Yanik Chauvin (Yanik’s Photo School) also has two well done Lightroom 2 video tutorials, using the adjustment bush and the skin soften brush.
Kerry, from Camera Dojo, has a bunch of video tutorials you will want to check out.
Colin Smith also has extensive Lightroom 2 resources and videos.
PhotoshopSupport.com has video tutorials, workflow info, and keyboard shortcuts just to name a few things they have on their Lightroom 2 resource page.
I hope you'll find these links helpful (translation - educational), now let the learning begin!
If you haven't bought/upgraded to Lightroom 2 yet, the post below will save you 15% when you do.