Calendar UI ideas needed

Hi all,

I'm looking for ideas on how to make the UI for editing the calendar as
good as possible. 

By "editing the calendar" I mean the feature where the user can set up
vacations, days off, non-default working hours, etc.

The code we have in libmrproject for calendars work like this
(simplified):

We have a tree with calendars, where children inherit their parents and
can override on a day basis. A calendar also has a default week, where
the default days are specified. 

An example to clarify:

"Base calendar" with default week Mon-Fri, working hours 8-12 and 13-17

All resources in the MrProject development department use the "MrProject
calendar" that inherits the base calendar and overrides the default week
so that working hours are 10-13 and 14-23 ;), and the occasional day
off.

Basically, it is a very general design for managing calendars, and we
want to create a UI that shows the flexibility without getting too
complex to be usable. 

Just to get started, one simple way could be to have the calendar tree
in a pane to the left, and the selected week from the selected calendar
is shown in the middle with the selected day to the right with a few
intervals that the user can edit. That would limit the possibilities
since we in theory could have an unlimited amount of intervals per day,
but my guess is that 4 or 6 would suffice.

Input and ideas are welcome!

/Richard

-- 
Richard Hult                    [email protected]
CodeFactory AB                  http://www.codefactory.se/