All these applications are available in the Appstore. Many more to come...
sayIt : simple and intuitive type and talk application
RSS Speaker : the app that speaks your favorite news and blogs to you (5 languages)
AudioGuidia: turn your iPhone into a smart audio guide to discover Paris
myLanguage Pro: a robust and comprehensive translation solution
Geolives: discover and share audioguides everywhere!
SurfnSpeak: listen to your RSS feeds with Acapela voices
Klaus: English to German phrasebook
Sygic: offline GPS navigation
Roadee: first iPhone GPS application based on OpenStreetMap
Twuner: listen to Tweets on your iPhone
Tick Talk : a clock reading RSS feeds
JustTouchIt: a Indonesian to English lexicon
Proloquo2go : very attractive, both in cost and features, AAC application
Speak it!: simple and sweet type and talk application
read2me: a document reader using Project Gutenberg
Future Apps iSpeak: translation software based on Google Translation (11 languages)
Acapela for iPhone 1.060