By documenting I mean screen shots, camtasia videos, things like that. If you haven't been doing this, start a file and start documenting successful campaigns, list growth, commissions. You never know when this stuff will be important to your business. I NEVER thought I would create my own product, but now here I am in the middle of 2. As I work through them, I am noticing a few gaps where it would be really nice to have a screen shot to truly describe that method or particular campaign.
Not only this, but it really helps to look back and evaluate, and measure your success. Start doing this today!