Yes, you will need to change the certificate....there are written instructions of who to activate windows....and yes, this slic will activate Windows 7 OEM when it becomes available.
Thanks to p4spooky and Busykid508. I'm using p4spooky's Asus A8N-SLI slic mod, and Busykid's GA-P35-DS3L slic mod. Both flash fine and show the slic 2.1 code at the right offset. Thanks again to you both.