Ok, I read the headlines – "Debian refuses to push out new NZ daylight savings info" or something like that. Everyone getting angry and annoyed. Sure enough, my Debian boxes (running etch) were an hour behind. The only info I could find was manually compiling new timezone info (which didn't really work).
ANYWAY – finally I found the quick and easy solution that I wish the alarmists had just said clearly in the first place:
Put this line in your /etc/apt/sources.list file:
deb http://volatile.debian.org/debian-volatile etch/volatile main contrib non-free
or for sarge:
deb http://volatile.debian.org/debian-volatile sarge/volatile main contrib non-free
then run the usual apt-get update ; apt-get upgrade and you're done!
Yay! Hopefully that might save someone a little time, hohoho no pun intended.
More about Debian volatile here: