Typography on the web has long suffered in comparison to print. The biggest limitation has been the limited number of fonts that a designer can use. It's still messy, but it is now possible to use a much wider range of fonts.
One of our goals with Webvanta is to provide designers with the best in open-source technology, without exposing them to all of its hassles. For our calendar feature, we've chosen Adam Shaw's FullCalendar.