If you work in a company then you may find yourself dealing in week numbers rather than dates. E.g. the deadline for this project is week 38!
Here is a free downloadable Excel calendar for 2011 that has the days of the week across the top, and then the week numbers for the whole of 2011 down the side.
Each day has five boxes for you to write in, and the days of the week are frozen at the top, making it easy to see which box is for which day.
I’ve saved two versions. One standard version for modern versions of Excel (2007 and above), and an older version which should work in Excel 97.