TV3 and 8tv have both made their programs available on their website with a service they call 'Catch Up TV'. It is and interesting concept. The format is much like Youtube (better quality) and they cut up each episodes into easy to digest parts.
I’ve read some where that the shows aren't going to be posted on the web indefinately and are only going to be offered for fixed length of time. Just enough for you to err.. catch up.
It's easy to find, right at the top 'Catch Up TV'.TV3