...
If you right-click on your dock you will notice a history of recent items even if you set the application to clear or not retain history. Simon Heimlicher wrote a good article.
Make Bootable Mountain Lion Disk
http://www.cultofmac.com/180925/how-to-make-a-bootable-disk-or-usb-drive-of-os-x-mountain-lion/
Rejected Application
http://appzapper.com - I went to delete Transmit and it still left files in /Users/tinpham/Library/Application Support/Sparkle. Not impressed.
...