Lightroom 3 has been out for about a month now, after being having many of it core components rewritten from the ground up over the past two years, and it shows.
In general, the application is quicker at most common tasks, and can greatly hence most images that it comes in contact with.
Already, I have been able to breath new life in several images because of the enhanced noise reduction algorithms, on images that were shoot with a high ISO speed!
Another area that I have been really taken advantage of, is the built in Publishing Service for Flickr.
In the previous version, one would have to export the desired files, and then bring them into Flickr.
With LR3, after you have connected to Flickr, you just export!
There is no need to create an additional set of files, which saves time and disk space!
Over the course of the long weekend, I have been able to publish many new images to Flickr with great easy, and I invite you to take a look at my Photostream!
There are a ton of new features that have been added or enhanced, and I plan on using and commenting in the future, so stay tuned!