I was so excited with the release of iPhone SDK and hoped I would be developing apps in no time like the demo showed by "Steve and his friends" . But not for long, I have almost entered the total frustration mode. Apple did a good job on their release with the first version of SDK with lots of documentation and example. The second version came as a complete disappointment to me. I can't believe they released a Interface Builder with absolutely no documentation or guide except for 10 lines of Release Notes. I am a complete newbie to Cocoa Framework and Objective C, never used IB but I am clearly not a bad developer. I have developed so many different apps for different platforms with different framework.
I really hope Apple releases a new version of their SDK + IB with more documentation/samples/guides.
Meantime, after some serious searching on the web I came across this link
I believe it's a blog of another frustrated developer but he has a nice tutorial on how to use the IB with the SDK.