Here is a link to one of my very favorite lists of Awesome Apps by Brandon Lutz, author of the original 60 in 60 Presentation. Brandon's entire universe of resources is at his Wikispace page. Try setting aside 15 minutes each week to explore these links. Some will only take a second, others might suck you in and keep you there for a while. So set a timer on your phone to make sure you don't get carried away. You can always visit your favorites later.