I don't submit it to anyone, it's just for myself. And, it turned out that I wasn't slipping at all. But, the peace of mind of being able to prove it to myself was good. A nice side effect is seeing which projects or types of activities take up my time.
Other accountability things I've been doing lately is writing more comments, documentation, and focusing on writing code that is easy for others to jump into (well structured modules, one-click dev setup, automated deploys, etc). That is, even on projects for myself or where I'm likely to be the only person ever to touch it. It is good practice to get into and it does help a lot when you're coming back to something after 6 months.