Fantastical from Flexibits has been my go-to calendar on the Mac and iPhone for a long time now. This week the company released an iPad version (US$9.99) that takes advantage of the device's big display. The app isn't simply larger on the iPad. The developers clearly sat down and considered how the additional room could affect Fantastical's functioning. The results are quite nice.
The biggest "wow moment" is the dashboard. The iPhone version provides either a week view or a monthly view (the so-called "Day Ticker") plus a running list of upcoming events. It's tidy, handy and definitely mobile. On the iPad, the Dashboard is much more feature-rich.