We opened an account with ANZ before we came over, and transferred money into it while still in the US. What we were told was that we could put the money in but the account would not get activated till we got here and went into the branch and presented our identifying documents etc. So, like M-Squared said, you can't withdraw the money or use it until you're actually physically in NZ to activate the account and prove your identity. It's a safeguard that allows you to have an account here ready for you when you arrive.
6/15/09 EOI
6/17/09 Selected (135pts no job)
7/22/09 Successful
7/27/09 ITA
11/4/09 ITA Lodged
2/6/10 CO
2/18 Interview
2/19 APPROVED
5/29 Passports to London
6/10 BLUEYS
7/3 ARRIVED!!