reader app :
http://www.codeproject.com/KB/iPhone/iPhoneDevReader.aspx
sample code : http://developer.apple.com/library/ios/navigation/#section=Resource%20Types&topic=Sample%20Code
sencha :
http://www.netmagazine.com/tutorials/build-ipad-app-sencha-touch
pdfkit : http://pspdfkit.com/purchase.html
Magazine Apps ;
http://ios-blog.co.uk/iphone-development-tutorials/how-to-make-a-magazine-app-in-ios-part-i/