I presume that you’re familiar with the long-time iPhone Twitter client TwitterFon (App Store link: TwitterFon free (now called Echofon) and the paid $4.99 TwitterFon Pro (now called Echofon Pro)) and was interested to find that the developers are moving from their current name base to a new product that at first will be exactly the same, however as discussed in the developers’ blog post, some interesting new sync features between the iPhone client and TwitterFox (Firefox extension).
This is from echofon.com
I have not regularly used the TwitterFon app for iPhone, but will be interested to see what they release in the near future.