Probably the best summaries I've seen so far have been from blogger and former Parliamentary staffer David Farrar on Kiwiblog.
His public submission on the Bill is here:
http://www.kiwiblog.co.nz/2007/09/my...ance_bill.html
His quick summary of the revisions:
http://www.kiwiblog.co.nz/2007/11/19...ance_bill.html