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Me, I’ll start with EPub format from O'Reilly, for the Apple iPad / iPhone / iMac.
1. Posting the question didn’t recommend a better post. O'Reilly loses a point.
2. To find a better post, I searched inside here for: iPad best format
That search found a post from a year ago:
Q: What ebook format can I read on iPad, iPhone or laptop, and how do I make it available on all 3?
3. Down in those comments, a year ago, O’Reilly Employee Paul Fichera gave us:
A: The ePub format can be easily used on an iPad, iPhone or
The PDF can be read on all 3 devices as well, but ePub works well with Apple products.
O'Reilly ebooks are DRM-free ...
The ePub is the best format for iBooks on the iPad. The best way to get it on the iPad is to
log into your oreilly.com account from the iPad, and download the ePub. Once it's finished
downloading in the Safari browser, Safari will say it doesn't know how to open that file, do you want
to open it in iBooks. Just tap on that and it will be added to your iBooks library.
You can use PDFs on the iPad, but the page layout is static, so you'll have to scroll and zoom a lot.
I hope that helps,
O'Reilly Customer Service