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?