The question comes around to " How do you know it is any good" shortly after you begin discovering the power of the Web 2.0 and APPS. That is a good thing!
There are several sites that I recommed for "vetting" apps etc . Use them if you have any question at all about the appropriateness for grade or performance level /content /ease of use etc.
Please take some time to visit the the sites below. Find your favorite and make it your go-to site to help you decide...if it really is any good!

I Education Apps Review's (iEAR) goal and or focus is to take a look at practical, useful, and educationally sound ways to use the IPhone or ITouch in the classroom. The IPhone, ITouch and other similar devices are amazing pieces of technology. We believe that these devices have a place in today's classroom as long as they are utilized properly.


TeachersFirst Edge shares teacher reviews of today's web tools and how to use them safely and within school policies as tools for teaching and learning.


Moms With Apps is a collaborative group of family-friendly developers seeking to promote quality apps for kids and families. Most of our membership is comprised of parents who have launched their own apps on the App Store, have their own access to iTunes Connect, and have the time and inclination to share best practices with other developers at the founder’s level.

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Boing Boing

Boing Boing founder Mark Fraunfelder and his charming daughter Jane review apps for kids every week. This week, they take on Glider Classic for the iPhone and iPad. Follow this link and enjoy! T
The site lists more than 700 apps but includes about 60 that have been professionally reviewed. The reviews are all done by a special education teacher or certified therapist,

iPad Apps for Autism A Google docs site
The apps are reviewed and recommended are classified into categories like art, language and music
Among the developers that are recommended are Injini, Toca Boca, Duck Duck Moose and Oceanhouse Media