Pure Grid Calendar is exactly what I've been looking for. My wife has one similar that came with her Eris, but my D2 only had an upcoming widget.
I really like Pure Grid Calendar widget if you want a one month calendar on your one of your screens. You have the option of a 4x2 3 week widget, 4x3 4 week widget, 4x4 1 month widget and 4x4 XL 1 month widget. There are plenty of beautiful skins to choose from too.