我能换工作吗？

I got I-485 approval and temporary GreenCard stamp in Nov, 2003. I was told that the physical card will be mailed to me within 9-12 months. Can I switch my job and move to another city? If I change mailing address with INS, can I still receive the plastic card without any problem? Is there any possibility that my GreenCard will be forfeited just because I change my job before I get the physical card?

Your answer and experience to share is greatly appreciated.