This year, I'm on my second full year of using standards-based grading in math. I've kept a lot of things the same, but am continually tweaking things. For one, I used to give completion points for homework, just 2 points per assignment. But, this year I'm not giving any points for assignments, which purifies the students' grades to just scores for standards. Instead, I am just tallying if the students complete their homework and turn it in. I hope that I can share this completion percentage with parents and students every so often so that they might see a correlation.
I've also added to the requirements of being able to retake a learning target. Students must either have a study session with me or turn in some practice problems they did before they can take a retake. I decided to do this this year because I would have many students in the past that would say, "Oh, I have to take a retake today?" It was obvious to me that students would not prepare for the retake and often make the same mistakes that they did on the original quiz. I guess I am forcing them to study, but they need to do some sort of studying to learn what they were missing the first time around.
If you are using standards-based grading, how is it going? Have you made any discoveries lately?