I saw it for the first time at a digital screen in the Phoenix, AZ area. It was stunning.
I saw it yesterday at a really nice theater with a nice, large screen. I felt like I was watching the entire movie through a filter or something. It was not nearly as vibrant or clear as the digital screening.
I highly recommend going digital
On a side note, if you check dlp.com the number of digital screens in the U.S. tripled from 21 before Star Wars Episode II to 63 upon the release of the film. Awesome! Now I want one closer than 200 miles from my house - especially before Matrix Reloaded comes out. The drive is a pain, but I'll make it to go see Matrix.