60 Apps in 60 Minutes (5) -- Brandon Lutz (6) not only has a great wiki, but also does a great presentation of apps at conferences all over the country. This wiki has links to all of his presentations and includes great overviews and tables of apps for education.
iEAR Apps Review (7) -- This wonderful site run by Scott Meech (8) includes app reviews by educators for educators. App reviews are organized by category for easy searching.
iPads in Schools Livebinder (9) -- Mike Fisher (10) has pulled together a ton of resources on using iPads in the classroom. There is a tab for "App of the Week" as well as a tab for "Best Free Apps."
Android4Schools (11) -- This site, started by Richard Byrne (12) (of Free Tech 4 Teachers (13) fame), is dedicated to all things Android. It's a great place for educators not using iOS (aka Apple) devices or those involved in BYOD initiatives.
Edutecher (14) -- A website and an app itself, this site is created and maintained by Adam Bellow (15) and allows users to search for apps by subject area and grade level.