From the "Who knew?" file of arcane knowledge: is this a cool deal?
Go to www.google.com. Type in: timer 15 seconds
Watch the screen.
How cool is that? And it's FREE, the best kind of deal.
You can also type in a specific time [ timer 10:45 am ] and voila! a built-in alarm clock. It has a limit of 23 hours 59 minutes, though.