Matt Gallagher of CocoaWithLove has put together a tutorial (with included source archive) demonstrating how to implement multiple row selection and editing functionality in a UITableView.
By default UITableView only supports single row selection, but Matt shows a way to detect single selections and store them collectively so you can show the multiple selection status on the table view. As one of the most commonly used visual controls on the iPhone, this is an illuminating look at how to extend controls beyond their inherent capabilities.
