I made a decision not to sign up for Apple's iBooks publishers' account (mainly because I don't own a Mac and use a Linux box most of the time -- also I don't want to buy ISBN numbers for my ebooks when selling them). However, I would likely be uploading content to the Apple store via Smashwords.
How can I find out the latest formatting requirements and CSS support for Apple's iBooks?
Unlike Amazon, for some reason, Apple doesn't make this information available anywhere. Can you recommend a good online resource for preparing your content for iBooks?
I can follow the Smashwords formatting requirements (and I have an iPad and iPhone to test things on), but some store/device specific information might make it easier to figure things out with.