I use Evernote 3.1 as a personal and professional diary and intenion tracking system. As a side note I hate hate hate the new version 3.5 of Evernote (I'm referring specifically to the Windows desktop client) which is a total step back in both functionality, performance, and aesthetics. I digress.

Evernote is good for this kind of diary function because it's so easy to add and tag notes and they are automatically titled and timestamped so there is zero resistance to writing in it.

When the mood strikes (once or twice a day, usually) I'll pop open Evernote and create a note to express what's on my mind - thoughts, feelings, impressions, details of my daily life, whatever.

If an entry I write is particularly meaningful or inspirational I will tag it with "Intention". I occasionally browse through these tagged entries to remind myself of my personalized inspirations.

Such a diary is sometimes good for helping me to remember certain things, like "What was the name of the couple that so-and-so introduced us to some months back?" I just search for "so-and-so" and voila there's the entry describing the meeting with the couple and their names.