For all of you KDE4 users, I wrote a project launcher widget similar to the Kate project launcher. You need to symlink or copy your project files into one directory since there is no central db like Kate has. It monitors the directory so as projects are created and removed, the list is updated. You just need to install the widget and set the path to the ST2 executable and project directory and enjoy creating and launching projects from your desktop!
If you are curious or want to improve it, the code is on GitHub: