This is the best app out there for IM on the iPhone/iPod touch. It supports: ICQ, MSN, AOL, Yahoo!, Jabber, and Google Talk. I have only tried the AOL, but it works very well. The graphics are awesome, and it has a lot of features. You can even take a picture with your iPhone camera, and send it to someone while you are chatting! (haven't tried that feature yet though). You can even swipe between chats/contacts. It seems like it could be made with the SDK. If you IM i suggest you try it.