SQL Server Central takes a look at Sarbanes-Oxley from a DBA's perspective in their Working Your SOX Off article. (Free registration required). There is some good solid advice in here. With this advice and a few third party pieces like FastPath's Audit Trail and Configurator software you can seriously smooth out the GP portion of your SOX compliance.
Not coincidentally, the next episode of the GP Rocks podcast is almost done and it's an interview with Andrew Snook of FastPath. Look for it here in a day or two.