Animoby is a sort of screencasting tool, but not really. The idea is to instantly create and publish products that include voice, drawings, and images.
This is a free app that is similar to iMovie. For an additional $.99, you can have full capabilities of adding photos, music, voice over, and transitions.
New iPad app from Adobe seems to combine the best of a lot of different apps - internal image search like Haiku Deck, record audio on pictures like Speaking Photo, plus even more.
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.
The Audio Memos app, mentioned here at Free Technology for Teachers, is a great audio recording option. The Free version is a bit limited, but the Pro version ($9.99) includes editing tools.
This app allows you to have full text-to-speech capabilities with eBooks on your iPad. Any book in the public domain can be read and listened to in one app.