i'm pretty good with technology, having used it quite a long time (my first tablet was stone). i do take the time to go through the manuals a few weeks after i've bought the devices and there is usually a few little tidbits i manage to pick up. don't let the size fool you. the iphone manual is scaled to fit on the phone, and the same for the ipad. and there is a lot of white space as well. they really are a breeze to get through in a few hours.
it seems all iOS devices always have a link in safari to their on-line html guides, but here are links to the PDF manuals:
iPad
iOS 4.0 guide (covers all hardware models)
iOS 3.x guide
iPod Touch 4.0 guide
You can find other manuals at
http://support.apple.com/manuals/#