Chronories is a diary software for Mac with lots of interesting features. In adition to being a journal software, it also records activity logs of your Mac computer including music played, RSS, emails, websites visited, and others.
Quintin Carlson wrote a nice review about Chronories that gives you an idea of what you can expect from the diary writing software. He gives the software 9 points out of 10. If you look for a Mac diary software that can collect detalis of your life including your daily use of Mac, check his review for more information.