Hey, I'm really concentrating mostly on the App Store. In addition to that I did a StackSocial sale once (https://stacksocial.com/) and apart from that whenever a blog or any guy asks for promo codes for a competition / contest / event to host on his blog / site, etc, I always give them redeem codes so that people that get the app for free may hopefully share their love by telling friends. Also, once I gave away 120 licenses for a big instagram photo contest in NY. That gave the app a lot of traction since all the people that got the license were really good photographers who used Instagram a lot. So they in return told many friends and tweeted about InstaDesk, etc.

But that's really it. I do have a non-app store licensed branch of InstaDesk that would work with a license file system, but I'm only keeping that alive in case the App Store becomes too draconian. Just so that I always have a way out. Though that's becoming more difficult now with the iCloud integration.

Hope that helps a bit.