This tip is especially handy for Mac OS X Lion users, but it should even work with Mac OS X Snow Leopard too. You’ll be able to activate a hidden debugging menu and other hidden secrets in the Disk Utility app on your Mac in the folders Applications –> Utilities.
defaults write com.apple.DiskUtility advanced-image-options -bool true
This will activate the new Debug menu which looks like this:
If you select the option Show Every partition in the Debug menu you’ll be able to see the Lion Recovery HD partition in Disk Utility which is normally hidden from view. It will look something like this: