Olive Tree BibleReader ... see youtube for all this offers
Notes Plus for handwriting (UPad deserves mentioning here)
FlipBoard and Zite are excellent special interest browsers
iFiles (for remote file organization / viewing / retrieving / from cloud services like dropbox, you're own ftp-server, FaceBook, Google Docs, Picassa, MobileMe, WebDav, Amazon, etc etc etc ... )
ArtStudio => for anyone wanting to get a little serious with doing digital artwork on the iPad
Photogenie for photo editing (although iPhoto is also good)
Evernote
EBay is sweet and very responsive with it's recent updates -> almost better than regular web browser.
Kindle
EASY BOOKS => AWESOME double-entry financial business software for anyone running a small business and wanting to keep track of profits, and categorized overhead expenses, invoicing regular accounts, managing payments, etc ... (May take a little bit to customized it's default template, but becomes more and more intuitive to use everyday. Very easy and organized. Also, makes filing at tax time very easy ... )