An education shouldn't be limited to Apple users so IF Apple really cares about students then why not offer the standard iBooks fully amazing version and a dumbed down iBooks for Windows or OS X or even Android?
Well, iBooks are just epubs, so the only reason they won't open on other platforms is because of DRM. There's a program out that removes DRM from iBooks, google something like "remove DRM ibooks" and you should find it. Once you remove the DRM, you should be able to read your iBooks anywhere and with any device that reads epub format. Only exceptions are the ones in the fancy new iBooks 2 format -- those really are iPad only, can't even be read on iPhone/iPod touch.