I have a 2G iPod Touch running iOS 4.2.1, I can get into my iBooks library, but when I try to go to the iBooks Store it crashes and I end up with the home screen.
I did notice last night after getting onto iTunes that Apple made changes to iBooks that prevent you from buying books through iTunes unless you have iOS 4.3.3 (of course I don't know if this was an option available before iOS4.3.3 came around - never tried - but didn't need to then), I'm guessing for those of us who can't upgrade to iOS 4.3.3 we are screwed as far as buying new books. Unless it is just a problem with Apple's iBooks web site that is causing it to crash.
So it looks like Amazon Kindel app will be getting all my book puchasing business!!!