I can't seem to exceed 50kBps until 2-3AM, and even then speeds are nothing like the 400-500kBps they should be.
Taken exactly 8 days ago:


Today:


I'd also like to hear what anyone from Xnet have to say about this.
And I really hope it isn't something like last time: "This is the nature of ADSL broadband services currently available in New Zealand"
Out of curiosity, what're your pings like to telstra.com.au, optusnet.com.au and internode.on.net?
EDIT:
grant_k:
I don't agree with the logic here. If the International Bandwidth is insufficient, it would affect all kinds of traffic equally, which is what appears to be happening.
It is possible that he just doesn't notice an overall slowdown. TBH, I only do when I go to pages with many images and/or flash.