I have to disagree. Using preview to read a large cook is not nearly as enjoyable as reading it on the Kindle [or, I hope, the iPad]. The iPad lets you read like it's a book. Turning pages is similar to a book.
You can e-mail a pdf document to Kindle and they will send it back in a few minutes in their eBook format. I have 2 200+ books that I did that with.
I only hope there is something similar associated with the iPad
Disagree on what point? Preview on iPad wouldn't be the same as Preview on Mac, it would be more interactive and more animation with multi-touch support, it'll have page turning and so on. Those are just animations, nothing to do with file format. PDF>ePub destroy the original formatting, period. It ruins the whole look of the book. Just because you had a couple of files that looked fine, doesn't mean the rest of them do fine, I did use textbooks and it turned out to be completely ruined.
PDF is the best formatting file support there is on the market for graphical novels, textbooks and any so on, they are same format that publishers use to print books with. If you want the best book experience, unfortunately, PDF is the way to go. ePub as far as I am aware, is weak for those type of content but it could evolute over time to support those.
Apple doesn't have to port Preview, they could've just easily add PDF support to iBook and add annotations, highlighting, bookmark support as well. That way we can just use iTunes to sync our PDF collection. Unfortunately, as far as I am aware, there's no PDF support for iBook.
Listen to the Keynote. I am under the impression you will have the ability to store files on the iPad. The iPhone OS has the ability to view PDF files, it is exactly like preview and works great.
Ok, how do I access those files without finder and the actual Preview.app? None of us knows how exactly we will be about to store files on the iPad, is it via iTunes or USB storage mount?
Just because iPhone OS supports PDF natively, it doesn't mean anything as long as I have to find another application, and than figure out a way to sync my PDF collection with that application. I don't want to email my PDF to myself and have Mail open it up for me or run a web server on my computer to load the PDF via Safari. Apple need to make it simple by adding PDF support to iBook and let us sync via iTunes or USB storage mount.