Okay I found it-- for Kassik and others trying to establish in-state residency at SUNY or CUNY schools, here is what you should try to accomplish as soon as possible upon arrival in our glorious Empire State:
Proof of citizenship or permanent residency
Student’s federal and state (New York State of course) income tax returns
Parent’s federal and state income tax returns (if dependent)
NYS Driver’s license or non-driver identification card
NYS Motor vehicle or other personal property registration
NYS Voter registration card
Lease agreement, canceled rent check, or rent receipt
Utility bills or canceled utility bill check
An account with a NYS bank.
Military service showing transfer/relocation to New York State
Sale of home in former state of residence
Purchase of residential property in NYS
Earliest date of relocation to NYS
Any other documents which you feel support your application.