Here's a recent comparison of Larva Labs sales data for 8/2009 of their Android port of their app versus their iPhone port. The money they made on their Android port wasn't even enough to cover something basic like powering on their computers. See: Paltry Android app sales. Here's a quote:

On Android it has sold, to date,
less than 500 copies. That’s
$1,046 total earnings, max. How
psyched are those guys that they
ported a huge hit to Android and
can’t even cover a party sub for
the release dinner?