Using a dialog box to edit a Curves adjustment layer

In response to my notes on how we've polished the Adjustments panel in Photoshop CS5, I saw a couple of requests for a way to edit adjustments (especially Curves) via a dialog box instead of via a panel. To do so in CS4 you can download and use this panel* (screenshot). In CS5 the architecture that supports extension panels has changed, so you need to grab the CS5 version of the panel. In case you