So far, I am finding PS CS4 to be a great experience. There seems to have been a lot of attention devoted to making everything work better. The whole package, and particularly Bridge, just seems much more stable and faster. When Lightroom was first released, I was concerned that Adobe would be tempted let Bridge and ACR languish in order to promote sales of LR as a separate product, but clearly that has not happened. Kudos to Adobe for continuing to improve Bridge.