http://wiki.linuxquestions.org/wiki/Plan_file
The plan file or dot plan file was a file in a users home directory and contained what the user was working on or thinking about. This file was displayed to other users when using the finger command. The file was located in the home directory: ~/.plan It is largely unused now, due to the discontinued use of the finger command on most systems for security concerns.

http://en.wikipedia.org/wiki/Finger_protocol
The program would supply information such as whether a user is currently logged-on, e-mail address, full name etc. As well as standard user information, finger displays the contents of the .project and .plan files in the user's home directory. Often this file (maintained by the user) contains either useful information about the user's current activities, or alternatively all manner of humor.

http://www.cadenhead.org/workbench/news/3128/first-blog-plan-file
Was the First Blog a .Plan File?