As I suggested above, if you use Digested for iBooks you can automate the ENTIRE process of pulling your notes (ALL OF THEM) out of iBooks and have them put into Evernote for you, all with a couple clicks of your mouse.
It is a good utility for the Mac:
http://drivenpixels.com/digested
Once you export them using your Mac you will have them in Evernote and can then view them on anything that Evernote runs on including Windows, Macs, iPads, Windows Phone, Android, Fire tablets, etc., etc..