Rainmeter is a customizable resource meter that can display various performance data in different formats. Rainmeter can measure:
The data can be displayed e.g. in a histogram, a bar, bitmap frames or just plain numbers.
The application is a Litestep plugin, but it can be used without the Litestep as well. You can use it even with the normal Explorer-shell if you like. Rainmeter also implements Litestep's wharf-interface so that it can be used with the lsbox-module. It might also work in a real wharf but this has not been tested as Rainmeter is not meant to be used in a wharf.
Rainmeter is developed and tested on WinXP, but it should work on Win98/ME also though Win9x is not officially supported. Also note that most of the included skins do not work on Win9x, since it doesn't support transparency.
And no, Rainmeter does not measure how much it rained last night (though it probably could ;-)