This is one of the main reasons I use cucumber, I write out a feature and then work my way through it. This works great on a side project because you can drop w

This is one of the main reasons I use cucumber, I write out a feature and then work my way through it. This works great on a side project because you can drop what you're doing and come back to it a couple of days later. You just run your last spec and get back into flow. To make sure you always know where to jump back in just make sure you have a failing scenario when you finish up for the night or whatever. It doesn't even matter if you've started writing the code for it, just write out the scenario in english and you're good to go.