I just got a press release announcing that the U.S. Women's Chamber of Commerce has launched an online education resource, called the USWCC University of Learning, that sounds pretty interesting. While it's not specifically geared toward meeting planners, it sounds like something every female (and male, for that matter) planner could use to tune up their careers and leadership skills. It's offerings are either free or pretty inexpensive, and it also gives access to articles, white papers, message boards, meetings (!), and discussions.
When I ever get a free moment (ha!), I'm going to check it out. If you get there first, please let me know what you think of it.