iCalibrate provides a user-friendly way to customize (or calibrate... ;-) Apple's iCal. One of iCal's most highly touted features is its simultaneous use of multiple calendars to help sort, organize, and clarify your life. iCalibrate 1.3 can now change any color, anywhere in any of your calendars. You can change month view event text, to do items, week view event backgrounds, and much more What's New: Version 1.3.1 adds iCal 1.5.2 compatibility. | 
