Mac OS X only: Freeware, single-use application Do-It provides a quick and simple way to create new iCal appointments without the clicking frenzy required with iCal’s default interface. Just launch it whenever you want to add a new appointment, fill out the details (the form is completely Tab-friendly), hit enter and go back to whatever you were doing. It’s a simple but wonderful improvement to iCal if the default behaviour has ever gotten on your nerves. Do-It is a free download, Mac OS X only.