Lately I've noticed that whenever I read something online that I very much like (or dislike) I find myself looking for the "vote buttons". A clear case of acute perlmonkitis. :-)
More seriously, PM has changed me as a programmer in a million ways, but none of them stand out in particular above the others. Just by being able to discuss a subject with people who know it well (or listening in their dialogues) one picks up a lot of good information. I find reading people's code illuminating often in ways entirely unrelated to the topic being discussed.
