I generally dislike ads, but don't mind them, if that makes any sense. Before ads, I'd like to suggest again that you publish the WCC to Handango/Palmgear/PDAGreen for $2.95 or a couple dollars more.
I believe the WCC is something people would pay for, and it is certainly worth paying for. You could keep it free here, and charge for it elsewhere. I'd probably even go buy it the next time a new version is out.