If you're interested in a digital approach to this, take a look at Labradoc (http://www.labradoc.com/) a site I created to make it easier to keep project logs.

I primarily created it for myself (http://www.labradoc.com/i/follower) because getting into the habit of creating project logs had a huge positive impact for me.

Here's an example of a small project I worked on earlier this year: http://www.labradoc.com/i/follower/p/project-sms-text-scroll...

I consider it a form of a "commit log for your day"...