I like to seed the current Ubuntu image on my computer, but remembering to start transmission every time I log in is a hassle. Here's how to start transmission automatically every time you log in to your user account on Ubuntu 11.10 (or other Ubuntu versions).
Click the add button:
Fill in the following:
You can change the name and comment to your liking. The -m in the command means transmission will start minimized, remove it if you want it to start visible.
Click the add button and you'll get the nice transmission indicator in the notification toolbar next time you restart.