Last night I attended Michael Reichmann's Lightroom seminar. I suspect that later in the development cycle, or perhaps after release he will hold new seminars. I recommend you attend if possible.
I find LR intuitive and easy to explore. In addition, there are plenty of blogs, articles, tutorials and forums from which to gain knowledge. Still, spending a few hours seeing the application worked through by someone closely involved in it's development was very worthwhile.
During the demo MR discovered a few bugs and took note of requests for additional features. He was at pains to point out that if we have requests we should put them directly to the development team. I joked that they were more likely to listen to him, but he's right -if you look at the forums suggestions are rapidly answered and debated by the developers. This is a new one for me in terms of major application development by a large concern such as Adobe.
There is a long way to go until release, but it's looking good.
Interestingly, MR mentioned that he rarely uses PS now, and when he does it is mostly for plug-ins such as PKS. So as of Beta 2 LR is his main DAM tool, editing tool, printing tool etc.