I have been using Picasa for over two years now. I absolutely love it. I have corrected MANY, MANY scanned photos from my grandparents photo albums with it. Each time I work on one for them, I show them the before and after and they are so amazed by it. There are so many features in Picasa...too many to name.
I know Google gets a bad wrap for trying to take over the world but I think it's sometimes ok for them to be evil. Case in point...
Today, my boss just walked by and asked me if I knew of an iPhoto equivalent for the PC. I said I never really heard of anything but a quick look soon pointed us to Picasa. Will it be as well integrated and easy to use as iPhoto? Maybe, maybe not. Is it free? Yeah... it's Google. I downloaded it, installed it onto the noisy Piece of Crap that sits next to my Mac and to be honest, it seemed about as shampoo simple as eye photo. Auto red-eye reduction, auto levels, etc.
So... quick, simple, free solution. Thanks Google. Proceed to be my overlord.