In a meeting today someone mentioned the need for a calendar of sorts. I immediatly thought of a Life Hacker post I had seen recently about MonoCalendar:

If iCal existed for Windows, I would recommend using that before MonoCalendar. On the other hand, since it currently does not exist for many systems, it is an alternative to consider, and furthermore it is an alternative that is Free Software.

[ MonoCalendar ]

Until Vista arrives, this is likely the best we'll see.