PayPal has launched an update to its mobile app for the iPhone, iPad, and iPod Touch. It now has a donation feature that lets users donate to over 23,000 charities in the U.S., UK. and Canada. "We hope the new application will simplify the donation process and help charities reach more donors," says PayPal Mobile Senior Director Laura Chambers. "We know most people want to contribute to causes near and dear to their heart,