In Mac OS X Lion, programs from the Mac App Store are downloaded in the order that they were purchased. Normally this is not an issue, but when you’re downloading 3 GB of Xcode, waiting several hours to install new apps is kind of a problem.

Fortunately, unlike iOS, Lion allows App Store downloads to be paused! Just click the Xcode icon in Launchpad to pause the download, and any other apps waiting on it will start downloading. Don’t forget to click the Xcode icon afterward to get it downloading again.