Try to go to a YouTube video, wait until the video is buffered and then reload the page. You'll notice that the video starts instantly and you can watch it directly from your browser's cache. This works even if you close the tab and open the same page later.
No, that doesn't happen in NZ because of ISP caching, everytime it will download another copy of the same clip, great for the ISP as they get to sell you the same bits again.
Do others get this same problem?