I agree.There is no reason why iBooks shouldn't have been there all along.
Yep, Apple's website says you can have as many as you want open. I just hope it syncs your pdfs and lets you do all the annotation features on them too, not just the epubs. From the website:The question I have is will you be able to have more than one book open at once on a Mac?
This is useful when you are working on a project and need to jump between multiple references.
http://www.apple.com/osx/preview/Apple said:If you’re a student hitting the books, keep as many open as you like and search through them with ease. When you quote an excerpt while writing a paper, iBooks adds a citation for you. And when you take notes, highlight passages, or add a bookmark on your Mac, iCloud pushes them to all your devices automatically.