He talks about it a little on his blog. Looks like he was using the raw API since it was pre-Component... which is impressive. Now some of that would be a bit easier.
Anyway, neat little example and it's fun to see people using WhirlyGlobe. Especially people who don't make me sign an NDA and swear never to reveal our work together. [cough]
I'm going to be at APPNATION this week. Yes, apparently it is all caps. It's the PREMIER app conference that's within walking distance of my house and happened to give me free exhibit space to hock my wares. So hocking I shall be.
My clients are usually the big firms that make apps for even bigger firms. This seems like the sort of thing they might send their project managers to. So I'm stalking users, basically.