Over 100 million applications have been downloaded in just a couple months from Apple's runaway success App Store... We're going to take a look at some of the top selling paid downloads from the app store and tell you if you really need them on your iPhone or not. This past week's most downloaded paid app was “Pocket Guitar,” which, as the name implies, turns your iPhone into a mini guitar. The app works like a real guitar... press or strum strings to play some rocking tunes, and you can set the program to play in acoustic, electric, muted, classical, electric bass or even Ukulele modes. The app also allows you to add effects like distortion, chorus, and delay, and at just 99 cents, this fun and independently created app for musicians is a steal. So I say, rock on with “Pocket Guitar.” I'm Marc Gittleman from Hard Drive 911 for TekieTV.Com. Keep watching for answers and updates on all your science and technology needs. Distributed by Tubemogul.