These are a number of sites which give away really great apps that normally cost money for free.
best-ipad-apps-free.jpg

This is usually for one day only and the sites also feature sales on other apps.
Here are the 2 free for a day sites I check every day for some very very cool free ipod/ipad/iPhone apps.
:-)

http://appchronicles.com/category/apps-gone-free/

and

http://www.dailyappdream.com/

And Appoday

http://www.appoday.com/

Apps Gone Free
http://appadvice.com/appnn

App Gratis
https://itunes.apple.com/us/app/appgratis-1-free-app-day-other/id565956236?mt=8


Appshopper app
App Store - AppShopper
or web site
http://appshopper.com/music/prices/free/


Texas Educators Twitter feed lists 10+ free Educational Apps every day
http://www.twitter.com/tcea