comScore released its ranking of the top 25 iPhone apps for February 2009, showing their estimate of the percent of iPhone owners that have downloaded each app. The winner is Tapulous's Tap Tap Revenge, with an astonishing 32% penetration in the US market, according to comScore.
Most interesting was the heavy concentration of games in the list -- 12 of the 25 are in the games category. Facebook, MySpace and AOL Instant Messenger apps also make the top 25 cut. If you consider social networking apps to be part of a broad entertainment category that includes music and games, the only serious apps on the list are Google Earth and Flashlight (and Google Earth is pretty much entertainment too).