This is real cool for people who use notepad to write down any info on a day to day basis...

In Notepad

*          Create a blank text file with .LOG as the first line of the file, followed by a carriage return. [ Enter ]
*          Save and close the file .
*          Double-click the file to open it and notice that Notepad appends the current date and time to the end of the file and places the
           cursor on the next line.
*          Type your notes and then save and close the file.

Each time you open the file, Notepad repeats the process, appending the time and date to the end of the file and placing the cursor below it

It  simply serves as a virtual diary ! 

PS: [.LOG is case sensitive]