If you use the default Calendars app on your Mac running OS X Mountain Lion, mini calendars are back. Apple took them away for a period of time, which was irritating since mini calendars always were able to show me things at a quick glance without having to manually click through months.
If you've never used mini calendars before or don't know how to view them, follow along and we'll show you how.
While mini calendars aren't a hidden feature or a knockout one, they do make it easier to quickly jump to things. I find them extremely useful when I'm nearing the end of the month and I need to see what I have planned for the following week. I no longer have to toggle between months in calendar view in order to do that. I'm glad Apple brought them back after their brief disappearance.