Once you’ve set up MobileMe, Google Sync or any other syncing service to wirelessly coordinate a desktop calendar to the Calendar app on the iPhone, it’s easy to start entrusting your every waking task short of heartbeat and respiration to a “ding!” and a pop-up notice. Instead of just remembering to do things using your frail, gooey little brain, you can hand it over to the phone, forget about it, and just do what it tells you to do every time the chime goes off.