davidcole:graemeh: Can anyone identify a New Zealand law that Slingshot break in offering this service?
They're not - afaik (It's been untested also).
What people are pointing out, that advertising in NZ media is likely to call attention to their service and some incumbent content providers in NZ may get snotty about it as it's cutting revenue they would be traditionally expecting (read: Sky).
There are other paid services around, but they don't advertise in mainstream media, and operate out of countries like the bahamas (unblock us).
As far as I know there is nothing to test and unless Slingshot are somehow dependant on the NZ content providers (in the way Vodafone appears to be for their content) then there is very little the content providers can do to stop Slingshot.
If I wasn't very happy with my current Big Pipe service I'd seriously think about switching to Slingshot just for this very feature.