Jim was a phenomenal teacher, speaker, hacker, and all-around good guy. He probably attended more programming conferences than anyone I know, and he was always more than happy to stop in the hallway, during lunch, or whenever to talk. If you have a moment today, maybe take some time to watch one of his talks:
http://www.confreaks.com/presenters/24-jim-weirich (there's
more than enough to choose from!)