The new timezone support is very welcome, but there's a problem.
After selecting Auckland as my New Zealand timezone I'm advised that "Daylight savings time begins on: 4 October 2009 03:00 00.".
This is incorrect, as can be found on the official NZ timezone page at:
Daylight Saving commences on the last Sunday in September, when 2.00am becomes 3.00am, and ends on the first Sunday in April the following year, when 3.00am becomes 2.00am.
Daylight Saving ended on Sunday 5 April 2009 (when clocks went back one hour).
It begins again on Sunday 27 September 2009 (when clocks go forward one hour).
Daylight Savings was extended a year or two ago in New Zealand. It seems the reference table WordPress 2.8 is using has not been updated.