Handango is a classic PocketPC software distributor. They publish a so-called Yardstick report four times a year, looking at software sale trends in the mobile space.
Our sister site TamsPalm has a “overview” of the Yardstick:
http://tamspalm.tamoggemon.com/2007/05/02/handango-yardstick-released/
What do you think?