Getting older, getting forgetful, sometimes very very forgetful,
I wrote a simple timer application which should remind me to do
...well..., um..., oh!, that smell in the kitchen...,
anyway, here is
Timerlein
and - as far as I can remember -
it's free :-)
You can download Timerlein for Mac OS X 10.6 (Snow Leopard) or later
here
July 2014, Timerlein is now available as universal binary for the two older systems
Mac OS X 10.5 (Leopard)
and Mac OS X 10.4 (Tiger)
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In case you need up to three timers at once,
you might want to take a look at the slightly different version of Timerlein

Timerlein III