Great article, I'd love to see more data about advertising/sales - especially conversions. How close of a correlation can you make with the banner placements and increase in sales. It seems like once you're in the top 100 listing, there is some natural momentum as well. Also do you know if the geared banners were direct click through to iTunes or if they used landing pages?
Judging from his current app up right now on Touch Arcade, it looks like it goes straight to iTunes (probably hits his server first to record where it came from).
