When you cant access internet,you will like a off-line calendar application.

Googi Calendar is a desktop application on MS-Windows.

 http://groups.google.com/group/googi-calendar

Its a nice off-line calendar application for Google Calendar.

Because:

 1.Its Graphic UI are similar to Google Calendar.

    (so you know how to use easily.)

 2.It able to 2-way sync all of your calendars wth Google Calendar.

   and sync very fast.

 3.Its free.

 4.it have some extra  features  that you may need,such as:

   A. Task lists.

   B. Show week number.

   C. Different color of weekend.(5 skins)

   D.View data-list with the range you want.

   E. Gantt Chart.

   F. Edit the output of printing.

   G.Sort data in list.