TwitterFon just changed their name to Echofon, in case you were confused. I like their iPhone application because it is easy to use and has a great method of displaying a difference between the Tweets you have read and have not read. The only caveat is that the unread Tweets become read if you switch tabs. The other issue I had was that there was no way to keep your unread messages synced with a desktop application. That is all about to change.
Echofon already has an excellent Firefox plugin that I used to use before I needed to use multiple accounts at the same time. Now, both of the above applications sync together and allow you to save your unread messages between your desktop and iPhone. Furthermore, they are planning to launch a native Mac OS X application soon that may become a great alternative to TweetDeck, Tweetie or Seesmic. I am looking forward to it’s launch but in the meantime checkout their iPhone application, I highly recommend it.
