There's only the official immigration service guides that I know of. I must have picked up that Blogcharm link on my travels around the Internet but can't remember what was in there now. If I find anything else I'll post it on here. I don't know if you've come across it already but this is the
INZ site which is the bible for potential immigrants.
Expression of Interest Guide
Tips for sending in your ITA .
Guide to applying for PR