Hoping to catalogue a bunch of app requests from people as we come across them in conversation etc. There is a good chance that some apps will already exist. They just need to be found. I'll start the ball rolling and add to it as things go along. If you know of an app that fulfils the brief, please add it to the comments.
RSS to speech app
Twitter to speech and voice recognition for commands and replies etc.
Meet up with me app. (press a button and all friends get told where you are and can come and meet you.. just a thought)