Here's some App Store insight. That first spike was due to my app Chessmate being featured on the top of the Games tab on the App Store. Yet, this almost tripled once it was included as a feature on the Today tab in the "5 new games we love" tile. Just shows that the Today tab is visited by far more than anything else on the App Store. It rose to number 1 in various charts just through that. Oh, and it always quickly tails off after a feature.