I got some email about Droplet, a physical button that you can stick to something to track when you’ve done something. The great thing about this is that instead of having to haul out your smart phone, you put the button in the environment you are working in and press it to signal you have finished. For location-based activities, this is great for developing habits. It uses some kind of hub to work with multiple buttons, and there is apparently a smart phone app that can remind you when you forget to do things.
It’s a little pricey at $79 for one button and one hub, but you can check it out on their Kickstarter page. I am a big fan of context-based workflow, so embrace your inner lab rat, develop some habits!