Deskbar Applet is a versatile Gnome panel applet. It places a small text entry box on your panel, and then allows you to perform a number of actions based on what you type in the text box. It's a VERY useful applet, and can replace a number of applets. For example, if you type a word, it will give you the option to look the word up in a dictionary, on wikipedia, or to execute a command if the word happens to be a command name. You can install applet handlers that allow you to install software packages, perform calculations, and do a number of other things.
I've written a timer plugin that allows you to quickly set timers.
To set a timer, simply enter something like
12m30s Check oven
This will add an option in the deskbar applet dropdown. If you click on it, a timer that is 12 minutes, 30 seconds in duration, called "Check Oven" will be created. When the time is up, a window will pop up letting you know so! If you want to cancel the timer, just enter anything in the query box... one of the options will be to "Cancel Check oven Timer".
If you don't enter a timer name, it is called "Timer n" where n is the number of timers that currently exist, plus 1.
The code: DeskbarAppletTimer