Garnered from the djbdns mailing list, we've got a couple shell scripts that parse configs for tinydns and dnscache. Very useful for spotting gross configuration errors. Truncated output follows..

hastur:/service# ~/bin/tinydns-showctls a.ns
****
a.ns
****

+++ Configuration options:
IP:216.235.147.21
ROOT:/etc/tinydnsx/root

+++ Apices of those parts of the namespace that will be served up:
147.235.216.in-addr.arpa.
147.235.216.in-addr.arpa.
mirrorshades.net.
mirrorshades.net.
...

(The reason for the dupe entry is both the primary and secondary nameservers are listed in the data file.)