It kind of does an what e.ggtimer.com does but only for minutes (just type in the minutes and hit enter). I could add some visual indicator of the percentage time left. You can also link to a time like this http://www.ianjorgensen.com/timer#10 or http://www.ianjorgensen.com/timer#0 to count up.

I like http://www.sardinesoftware.com/, he sels the most simple apps 5 bucks a piece! Its not a bad idea.