The first chat application for iPhone is AIM only, I wished if there was implementation from web messenger services such Meebo or eBuddy. This is one of the most requested AJAX application for iPhone, and certainly we will see more development in the very near future. Most important is to run it on robust server, because the current iChat seems to be experimental, sessions are limited to 10 minutes.

Use your mouse to flick (drag and release) your buddy list up and down like you’re supposed to on the iPhone. Click a buddy to start a conversation. You can open multiple conversations… flick left/right to change conversations. Currently there is no groups support, No buddy icons, and Opening more than 4 conversations gets unruly.

iPhone link : http://www.publictivity.com/im/
Website : http://www.publictivity.com/iphonechat/