This. Just familiarizing yourself with developers of popular/widely-used codebases helps immensely. Make sure to stray outside of your peer group for this, too.
In addition to the other suggestions, take a personal interest in technologies you may not be able to use professionally. If you write Java at work, maybe go learn Erlang. If you build web pages, go learn database optimization. If you do anything other than security, learn how exploits are discovered.
