BusySync lets you share iCal calendars with family or coworkers without the need for a dedicated server. Shared calendars can be viewed and edited by multiple users, and changes are instantly synchronized across the network. Shared calendars can be edited while offline and are automatically synchronized when reconnected to the network.

Daring Fireball readers can save 20 percent on BusySync through Dec. 31, 2007 by using coupon code DARINGFIREBALL.

This RSS sponsorship ran on Monday, 17 December 2007.