What are Twitter Apps?
Apps is short for Applications - so TwitterApps = Twitter Applications. Twitters apps are developed by third-party developers - who use twitter API to develop / replicate anything from simple functions such as posting messages...more >>
http://trottr.com/ "Hear I am!“ - trottr allows you to send audio messages to anybody around the world. Any time - and from anywhere. All by making a simple phone call. Whenever you feel like it, you can let your friends, family and colleagues listen in on your life – true to our motto. All your updates are being sent to your twitter timeline automatically - you can even answer by phone.
http://twitwoop.com/ Call a twitwoop number and leave a voice message to your followers. twitwoop lets you send voice messages to your Twitter timeline. Register your phone and link your number to your Twitter account. After that you can call by phone, speak a 140 second message ;-) and wooops, its in your Twitter timeline. Some ideas: let your friends listen, when you are at the U2 concert, let them hear some ocean breeze, sing a song or tell a joke. Its up to you.