The new 8.3 ASA code has made some MAJOR configuration changes, particularly concerning natting. Take a peak at http://www.petenetlive.com/KB/Article/0000247.htm
and of course the migration guide: http://www.cisco.com/en/US/docs/security/asa/asa83/upgrading/migrating.html to start seeing what all is changing.
Is there a reason Cisco now has us permit incoming traffic to the inside address rather than the public IP? No more Nat0??? I feel like I am going to need to learn natting all over again.