how to transfer epub books on mac to ipad

If the books exist on your computer and not just on your iPhone, it's just as easy as adding songs to your iTunes library and then to your iPad.

If you only have them on your iPhone, I know that if you log into your O'Reilly Media account you can download them all again in epub format. I don't know about Sitepoint, however.

Open iTunes, go to the File menu, and select "Add to Library."

Navigate in the dialog box to the location on your drive where you have found your eBooks.

Select them, and press "Choose."

iTunes will import them and they'll now live in the "Books" section of your Library.

Now, to add them to your iPad you've got a couple choices. I tend to manage my movies, books and videos manually, because I just like to do that. You can do this by checking the "Manually Manage Music and Videos" when you have the name of your iPad selected in the devices list.

Manually Managing your iPad's Inventory

Select the "Books" section of your library.

Select one or all of your books.

Drag and drop them onto the iPad's section of the Devices list. Wait for them to copy over. That's it!

Automatically Synching your iPad's inventory

Select your iPad's name from the list of devices in iTunes

Click on the "Books" tab a the top of the window

Check the box to "Sync Books" and choose to either sync all or selected books.

Sync your iPad. That's it!

Or you could try this...
http://answers.oreil...e-ibooks-store/

Of particular note is gavin.carothers' comment:
In addition to the Apple provided iBooks reader application there are other reading Apps for the iPad. One of my favorites is Ibis Reader which is a web based and HTML5 ebook reader. To start reading O'Reilly books on the iPad you can go to http://oreilly.com/e login, and select a book to read. Then simply tap on the "Read in ibis reader" link and you'll be sent to the Ibis Reader web app. You can read your book online on the normal browsing interface, or go to http://m.ibisreader.com to install the HTML5 Local Storage version so you can read your books offline.

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