All of a sudden though, it seems to be available in NZ. And judging from their legal page it appears that they have sorted out licensing here.
13.4 The Pandora Services are owned or licensed by Pandora and are protected by the copyright laws of the United States and other countries in which the Pandora Services are made available. You will not sublicense, assign, or transfer the license granted to you under this Agreement. Any attempt to sublicense, assign, or transfer any of the rights, duties, or obligations in violation of the provisions of this Agreement is void. Music is licensed in Australasia by PPNZ Music Licensing, http://www.ppnz.co.nz
Is it just me? Did this happen some time ago?