Just to clarify:  If you want to be certain that your domains will always
resolve (and reduce the number of lookups required) you should always
have nameservers that are within the same domain they are nameservers
for (aka "in-bailwick") and use glue.  This of course requires you to
notify the registry when the IP address of your nameservers changes.
Unfortunately some registries have bugs in their delegation scripts that
make things difficult.

Hope that helps,
		Andrew
-- 
mailto:xanni§xanadu.net                         Andrew Pam
http://www.xanadu.com.au/                       Chief Scientist, Xanadu
http://www.glasswings.com.au/                   Technology Manager, Glass Wings
http://www.sericyb.com.au/                      Manager, Serious Cybernetics
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P.O. Box 477, Blackburn VIC 3130 Australia	Phone +61 421 775 358