My girlfriend bought this really far out butter dish at the King Arthur Flour store in Vermont.
Its a ceramic cup that you fill with butter and then invert into a larger ceramic cup filled with water.
The water seals the butter and keeps it from getting nasty while not in use. And when you take the butter out of the water its not all wet 'cause its, well, butter.
At first I thought this was gross, but it works quite well, and you always have room temp. butter.
You just need to change the water every couple of days.
Apparently it's French.

Here you go:
http://ww2.kingarthurflour.com/cgibin/htmlos.cgi/14140.5.754905739317257303

Zachary
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...all I ask is a tall ship and a star to steer her by.