So the post on iphone appstore SEO has been very popular - here's a new trick which I just spotted out in the wild. So one factor in your iphone appstore ranking is the number of reviews. Storm8, a mobile games developer has worked out a great way of encouraging users to leave reviews and more generally promote their games. They have a feature in all their role play games called "recruit" where you add other players to carry out missions and gain points. As a result, this has lead to an increase in reviews on the appstore as users will publish their player ID in the review as a way of getting more recruits into their network.
Very clever - Storm8 have had every single game they publish get into the top 10 on the appstore so they are one to watch.