I haven't got around to read about Dave's SwitchABit until now but it sounds a lot like what I had in mind with Appily except, where Appily's approach is client-side, SwitchABit is server-side. Or is it client-side too, like Radio was? Either way, I think Dave is on the ball: personal service combinator.
As a business, I think server-side is better but that's seemed less exciting than client-side to me when I was sketching out Appily. I wish I had more time for Appily. What am I doing now? Working my butt off to launch something exciting in the security space.