I’ve seen a lot of marketing campaigns over the time I’ve been an App Store junkie, but certainly one of the most creative is the ongoing contest sponsored by Headcase Games in order to promote their match 3 puzzler 180 (iTunes Link). You’re allowed to enter once each day by tweeting two different messages. So what does the randomly selected winner of the day get? Two apps for $1.99 or less each!
Sure you could pick 180 as one of them if you don’t already own it, but I’m pretty sure this is the first time I’ve seen someone use the allure of other people’s apps to make people aware of their own. Personally I hope they get some good return out of it eventually, because Ron overt at Headcase Games has put a lot of work into maintaining this contest. Go support them by RTing their messages and buying their game.