Until the end of March 2013, BusyCal 2 is on sale for 40% off at $29.99 in the Mac App Store.

Many Mac nerds are disappointed with the built in Calendar (formerly iCal) app and have happily forked over the money for BusyCal 2 - which ironically enough is as much as the OS X Mountain Lion upgrade itself.

Screenshots

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You can download a trial version or check out a screencast by Don McAllister to find out more.

Link via MacSparky.com