I set up Beeminder recently and it's been helping me make progress on a few things:

• Going rockclimbing once a week. I'm using this to track how much I climb every week, but me doing this can mostly be attributed to Roger and I committing to do it together on a specific day every week.
• Doing homework / studying for about 8 hours per week. I'm hoping this will eventually cause me to spend slightly more time on schoolwork than is absolutely necessary to do my homework; I'm still calibrating how much time I should aim for per week.
• Doing a weekly review every week. Doing this made me feel WAY better this week. I've set up a GTD system with an Incompletes note in Evernote (so I can update it whenever I have my phone on me), and knowing that I have a safe place to collect all of the nagging tasks I have to deal with and a way to know when I really need to deal with them has made me feel a lot more in control of things.

I've also set a habit of, when I'm deferring tasks, to just give myself one or two Big Action Items per day; this makes it a lot easier for me to focus on things. The combination of this, plus tracking my homework time and doing a weekly review, should hopefully allow me to get enough sleep every night; I've been doing quite well at this so far, with 9 hours almost every night. (It doesn't hurt that I have a particularly late schedule this semester, though, so hard to tell exactly what's causing this.)

I also tried out Fitocracy. I still generally update it whenever I do something active, but the amount of that has lessened since the school year started, and I don't really have enough free time to think impulsively, "I want some Fitocracy points, I'm going to go exercise." (I get TONS of points for rockclimbing every week, though.)