Tax HELP :) Newlyweds w/ 2 comparable incomes?

I'm trying to start things out right for January 2010!! We got married in August 2009. I make $43,500 and he makes $36,000. I have a son which I have always claimed and will continue to claim. What should I claim for allowances for federal and state and what should he claim? We live in Georgia. Right now I have his at 1 and 1 and mine at 2 and 2. I've been reading about two earners/multiple jobs but don't quite understand the worksheet. It says something about the person who makes the most should claim the allowances for both and the one who makes less should claim 0 and 0? Also for this past year should we file married filing jointly or married filing seperately. I've been told to never file married filing jointly? I appreciate any feedback. Thank you :)