Married in Sep. of 2006. Got a CGC in May of 2007. Filed with my wife I-751 in March of 2009, had an interview in July of 2009. Still [ today is February 16 2010] my case in pending. And we are thinking about a divorce. What are my chances.. Thank you

Put the divorce on hold until you get new green card... if you can't make it, then you would need a very good immigration attorney.