did your product get better today
There's a little test I give myself everyday. At the end of the day I ask myself if today my product got a little better. In a small ISV it's hard sometimes to make sure you're making forward progress. There's so many things to do, many of which aren't moving the product forward. While these things have to be done, it's easy for them to eat up an entire week before you know it.
So I've found an easy way to test this is the question above. If you've said no more than a few days in a row then it's time to refocus and get back to improving your product.