Here's a link to Goodereader's list of Playbook apps:
http://goodereader.com/apps/playbook...-android-apps/
There's a fair number although of course not anywhere near what the Play Store has.
But for kids, depending on what you want to give them access to, it's got to be better than a no-name tablet and with double the memory and with the cameras, usb slot etc.. at $130 its a great buy (in my opinion)! Lots of space for videos, books and music!