I've installed various mental habits from my time on Less Wrong. My habit of trying to notice rationalization as it happens, in combination with the "Tsuyoku Naritai" attitude, led me to become much more serious about physical fitness. In the last fourteen months, I've gone from moderately overweight and sedentary to lean, fit, and strong, with a minimum of the motivation issues that had previously prevented me.

I've never attended CFAR and am not especially deeply involved with LW, so this may not really be the kind of example you're looking for.