If you've got iCal, Evolution, Mozilla Calendar or KOrganizer, you're in luck. iCalShare contains a variety of free user-created calendars which track important dates for gamers, from automatically-generated platform release dates to World of Warcraft instance resets. Note: some are under the 'tech' category rather than 'gaming'.
Windows users without any of the above may be pleased to know that Mozilla Calendar is also free, but you'll have to switch to Linux or Mac OS X if you want any of the others (for now).
[Thanks, Vincent]
