There was a some talk a while back about Lightroom. I've been playing with it quite a bit lately and I have to say I'm pretty impressed with it. It's a very slick application and fairly easy to use. Mind you it helps to watch these videos:
http://www.adobe.com/designcenter/lightroom/articles/lir2am_videotutorials.html
I'm really looking forward to seeing 3.0 when it's finally released.
Threaded Mode