When you delete pictures and movies, they go into iPhoto’s Trash—located in iPhoto’s sidebar—where they remain until you Control (right) click on Trash and choose Empty Trash (Similar in iMovie and Mail etc).
Mobile Mouse is a remote control tool for Windows and Mac computers that isn't just a mobile trackpad and keyboard but a remote control with a library of specific application interfaces and an application launcher. Basic version is free, get it here.
Install theft tracking solution Hidden and you'll know your MacBook's coordinates, screenshots, webcam pictures, and other incriminating data—and the app (normally $20) is currently free. Get it here.
VirtualBox 4.0 makes creating virtual operating systems a lot less bothersome. The interface is easier to get around, the virtual machines easier to move or wipe away, display and hardware compatibility is improved, and new "extensions" can add new capabilities. Get it here for free.