Daileez.com is an icon-based web diary/iPhone app.
So you login, and then select icons for various attributes of the day — weather, mood, sleep, level of mental activity, etc. There are also a series of activity-related icons. Add a short summary of the day, and you’re done.
Not only would I use this, but I would pay for this except for the fact that there’s no RSS feed of your activity. Instead, they encourage you to post your entries to Facebook and Twitter or add a widget to your website. No thanks.