Now that Apple has announced a new iPad, lots of people want to get rid of their old one — possibly on eBay or Craigslist — and get the new version. But if you do, be sure you completely erase all of your data.
This article from Apple’s support website explains how to use the Settings > General > Reset function to erase all content and settings
CNET’s Donald Bell has produced an excellent video on how to backup and erase iPads and iPhones. This includes ways to use iTunes to backup and restore the device as well as ways to just quickly erase it from within the iPad’s settings menu.