CalendarDC is a really professional calendar for your Windows desktop. It has transparent interface with many type of calendar: month calendar, day calendar, year calendar. More over it has weather tool which you can observer weather at anywhere in the world, at the current date and next days. You can also manage your time efficiently with event managing functions, it can send email to you at selected date and time.

You can download at calendardc.com. It offere a Free as well as a Pro version.