Howto clean up OSX Launchpad's Apps

If you've got a lot of non-existent or deleted Apps showing in Mac OSX Snow Leopard or Mac OSX Lion's Launchpad, you can start afresh by delete the Launchpad database, and that will make it rebuild a new one.

1. Navigate to ~/Library/Application Support/Dock
2. Drag all the .db files to the trash
3. Restart Dock

$ sudo killall Dock


Or, wholely from the command line


$  rm ~/Library/Application\ Support/Dock/*.db


and then kill the Dock


You may need to make your ~/Library folder visible first by doing


$ chflags nohidden ~/Library