My Launchpad organization was reset with Mountain Lion. How can I recover it?
According to this article, you can force a Launchpad reload by removing a .db file in ~/Library/Application\ Support/Dock. This file is the SQLite database for Launchpad. Theoretically, you should be able to recover the file, which has a name something like: 5187B29E-A5A8-4CD6-A688-28D426B923F6.db and move it to the correct place. Note that you should backup the current .db file before doing this.