I know objective-c and now I am waiting for my books to arrive. But they still need two weeks to come. So I would like to start with online tutorials. Does someone know any good ones?
Pragmatic Programmer has a screencast set that is suppose to be good. Haven't tried them yet but plan too. There is a free one as well for the Hello World demo.
http://www.pragprog.com/screencasts/v-bdiphone/writing-your-first-iphone-application
Stanford also offers their iPhone course material online for free: http://www.stanford.edu/class/cs193p/cgi-bin/index.php
The stanford course is a great place to start. You'll also want to check out AppsAmuck - they recently did an "app a day" project where they put together a simple app every day for 31 days and posted the source code. Makes for a great reference on top of the Apple sample code for figuring out those "how do I do this" type questions.
I've made this post a community wiki. Feel free to edit this list, and add to it as you see fit.
http://www.iphonedevcentral.org/home.php
They have fantastic screencasts, for all experience levels.
Has a great set of tutorials, unfortunately the page has become stagnant lately.
http://forums.somethingawful.com/showthread.php?threadid=2948566
There's a decent tutorial on making paper football in this thread.
http://iphonedevelopment.blogspot.com/
Jeff LaMarche is always teaching me new things, and he releases fantastic templates on a regular basis. Be sure to check out his OpenGL template, it has become the basis for a set of tutorials I'm writing.
http://www.iphonesdkarticles.com/
Has great tutorials explaining the basic components.
http://iphonedevelopertips.com/
Has tutorials less frequently, but they occasionally post some great information.
Has daily links with new information. Great new website to add to your RSS reader.