Hi, You may have noticed that the final version of Camera Raw 4.5 has now been released. Also Lightroon 2, which supports the E420 & E520. So there will presumably be no more updates to Lightroom 1. I have thouht of getting an E520 in a while (when the price drops a little), and letting my wife have the E500, but I don't fancy paying Ł81 to upgrade Lightroom. It appears to me from the trial that most of the improvements are in how it interacts with CS3.
John