Looking for something similar to what is discussed for one of the mozilla sunbird issues at
https://bugzilla.mozilla.org/show_bug.cgi?id=157270 .
Timeline with three or twelve months down the left side, which day of the week (ssmtwtf) across the top, and the day of the month (1-31) in a row with the month name and the events using colored bars (all day) or lines (appointment).
Instead of forcing to quarter (1,2,3,4) or year (Jan-Dec) allow a 3 month window that can be scrolled across the years, so you could look at something like Feb, Mar, April.
Also, if you hover over or click on a day, give a text list of events that span that day.
Finally, allow printing of the yearly or quarterly overview.
The actual layout implementation, how it fits on screen, and how events and labels are handled does not matter much as long as it is useful. The biggest obstacles would seem to be how to fit it in available screen space and how to maintain reasonable performance.