Question #1: My divorce was finalized  in November of 2009. Since I was married for most of the year do my  ex husband and I need to file a joint return?
 
No. As long as you were divorced before  December 31st, 2009 then the IRS considers you a single taxpayer  for the whole year. You should therefore file an individual return.
 
Question #2:  I have moved since I filed my last tax return. Is there a special form  or something I should include with my new tax return to notify the IRS  of the address change?