Slashdot carried this story yesterday on a BIND vulnerability:
http://it.slashdot.org/story/09/07/29/0028231/New-DoS-Vulnerability-In-All-Versions-of-BIND-9
The upstream report:
Red Hat's Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=514292
From what I'm reading, if one has an Internet-facing master for a zone, one
is vulnerable, even if dynamic DNS isn't being used.