While I've been using calendar for quite a while, I only recently found out (by seeing the code) that you could actually select date ranges in the year view.

There is little visual feedback if you try this, I would like to suggest a couple of enhancements.

* make the selected dates more prominent: eg. make them a box like the today box is, but blue background and inverted text
* give a mousedrag outline from starting point to endpoint (like a box outline covering the selected area between start and drag point)
* keep the dates selected even when dragging over blank space between month calendars: currently if calculate_day_month_for_coord returns nothing the selection dissapears.