Answer
Similar to the Doctypes for Agile Planning the Developer Diaries Doctypes help to store information you gather during your work on a project. You do not want to burden yourself with updating these information. Rather you want to log the information to your journal to gain insights and have a reference for later use.
While the Doctypes for Agile Planning target at helping a team to collaboratively work within iterations and record information relevant to them, the Developer Diaries help individual developers to track their work and improvement.
Organize the events of a day in your diary. Keep everything on a separate wiki page to make this information easy to reference and find. Group information into clusters of Subjects, Tags, and Categories. Track your excitement and mood of your working days.
Developer diaries help you to organize your discoveries easily.
