Is there a more-accurate indicator of an app download's progress than what appears in Launchpad? While downloading an application from the Mac App Store, you are presented with a progress indicator in Launchpad, like so:



For a large install (like Xcode, as shown) this doesn't provide a terribly useful picture of the download's performance (how fast it's going / how much longer it's likely to take).

Is there any way (perhaps via a command-line tool) to get a more-accurate look at the progress of an App Store download? Something more along the lines of, say, 585,789 Kb / 1,768,231 Kb Downloaded?
When you are in the App store, click on the "Purchases" button on the top bar. This will give you the total size of the app as well as how much has been downloaded. I think it even gives you an estimated time frame until completion.