Looking for a tasty app? Below are some"go to" resources for both Apple & Android-based systems:

Short on time and need your apps served in a hurry? If you click only two links on this entire page...
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check out "Graphite" which is a searchable collection of high-quality, categorized (by content, grade, price, etc.) & pre-evaluated educational apps for all platforms: http://www.graphite.org/ (Graphite was created by the amazing "Common Sense Media" folks!)
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and then go to "AppoLearning" for even more! (https://www.appolearning.com)

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Apptic should be your first stop for iDevices...well over 1000 apps categorized in multiple ways for easy searching
More here with app educational integration support: http://teachwithyouripad.wikispaces.com/iPad+Apps
24 iPad apps categorized by Bloom's Taxonomy: http://www.eschoolnews.com/2013/03/15/24-ipad-apps-to-support-blooms-taxonomy/print/
Even more educational apps nicely categorized for easy searching here:
Multi-platform & Special-ed specific: http://spedapps2.wikispaces.com/

List of 50 free apps being used in education: http://edudemic.com/2012/10/50-free-android-apps-being-used-in-education-right-now/
Tons of educational apps and uses: http://www.freetech4teachers.com/2012/03/10-awesome-android-uses-and-apps-for.html
More apps listed by category here (also has iOS apps): https://gethappy.wikispaces.com/
Free educational apps: http://issuu.com/medkh9/docs/educationalandroidapps
Last year's "top 10" Android apps for education: http://www.eschoolnews.com/2012/06/01/new-10-of-the-best-droid-apps-for-education-in-2012/
List of reviewed apps by category: http://www.ikidapps.com/2012/03/60-best-android-kids-apps-reviewed.html
Another list of apps tagged for easy searching: http://www.android4schools.com/
Multi-platform & Special-ed specific: http://spedapps2.wikispaces.com/