After spending a few more hours looking around the web, I tried the
Discussion Boards on Apple's website -- I've never been there before. But
apparently other people were experiencing similar problems after installing
a particular version of the Cisco VPN Client. Which is what I installed
about a month ago (and hadn't yet had the reason to use).

Uninstalled, restarted twice, problem gone. :)

Woohoo!

-Ry
[EMAIL PROTECTED]