iChat and AIM for iPhone

I like my iPhone very much, but I was unhappily surprised to learn that it doesn't have iChat and AIM built into it. I suspect this is because AT&T wants you to get used to paying for SMS. But I just learned about a service called JiveTalk that lets you use instant messaging on your iPhone. I tried the alpha version it and it seems to work well.

JiveTalk for iPhone (alpha) Features:
• Multiple IM networks, multiple accounts per network: AIM®/iChat, MSN®, Yahoo!®, GoogleTalk®, ICQ®, and Jabber
• Automatically reconnects in case of data service disruption, including phone calls, loss of cell coverage
• Real-time chats, quick switch between multiple simultaneous chats, intuitive chat interface: - click to browse, call, or send an email directly from the chat screen
• SSL encryption of all over-the-air data transmission

Future versions promise to include buddy list management, privacy controls, and the ability to email your chats. Link