Participating organizations or sponsoring companies offer on-site internships and full-time jobs.
Career advisors occasionally host office hours and "What is there to learn?" discussions with established contributors of the participating organizations. Logs from past discussions are available.
op-career-advisors AT SPAMFREE gnome DOT org - is an alias that reaches a group of people willing to provide resume feedback and strategize with you about your career - it currently includes Erin Berkery-Rovner and Tim Chevalier.