Holding down the Option key in Launchpad lets you quickly delete or move an App. Makes things a little bit quicker for anyone used to click and holding on an app instead. Also brings up the 'X' for all the apps at once.
[crarko adds: When I tried this the app screen went into 'wiggle mode' so I could move the icons around, but the only ones that had the 'X' for deletion show up on were those that I had downloaded and installed via the Mac App Store. I assume this is a permissions-related effect. Please post your observations about how this works for you in the comments.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20111011073128106