"Lexico-Cognition is an App to develop language understanding, vocabulary building, cognitive, memory and auditory skills in a playful way. It was developed and tested by qualified speech therapists. "
We use VoiceThread in a lot of our EdTechTeacher workshops as it is completely web based and now includes an iPad app. As a tool, it can create digital stories, be used for foreign language exercises, or support the creation of collaborative study aids. This library is a database of articles about successful VoiceThread projects.
Though this is not necessarily a post specific to the iPad, many of the suggested resources either have apps or can be used on the iPad via a web browser. There are some interesting concepts for ELL/ESL or even foreign language learning.
This is an incredible site to use with mobile devices equipped with a QR Code scanning app. You type up to 100 characters and it generates a QR code that then plays an audio clip. You can designate 1 of 40 languages. While it does not translate, it does speak in the target language. Could be a great resource for foreign language teachers.