I am, once again, maintaining a calendar of Formula 1 events. Here is the link if you want to subscribe to the Formula 1 calendar. This year it is shared by MobileMe rather than Google Calendar as I have stopped using Google Calendar.
Currently contains the pre-season test dates and announced car launch dates for the 2011 season, as well as all-day events for the days of the race weekends. I will replace the all-day race events with the specific practice/qualifying/race sessions for each event as and when they are confirmed by the FIA.