I've just this weekend gotten everything configured and set up on my server and I'm now officially the NZ mirror of the squid-cache.org website.
You can find the site here.
It'll be interesting to see just how much traffic it generates. For NZ users it should be much quicker than anything offsite as my ISP has connectivity to both the Auckland and Wellington Peering Exchanges where most NZ ISP's share traffic for free (and have low latency usually ethernet connectivity to each other).
Update: as of October 2005, I have moved to Australia, and therefore this mirror has been taken offline. At this stage I do not intend to set up an Australian mirror as there are already two large mirrors that cover AU here, and there seems to be little point in me adding another.