I too had the stuttering wonder movie issue on two computers. Both have SB Live! but one is running a ATI 9800 Pro 256 and one is running a ATI x800XL. Both use latest Omega drivers and current SB Live! drivers.
In both cases, I was able to fix the stuttering wonder movies by changing the anti-aliasing multisamples back to 0 in the Civ 4 Graphics Options window. (In the Omega driver control panel, I set both to Application Preference.)
If you're experiencing the stuttering movies, and you changed the anti-aliasing to 2 or 4, give this fix a shot.
-C
In both cases, I was able to fix the stuttering wonder movies by changing the anti-aliasing multisamples back to 0 in the Civ 4 Graphics Options window. (In the Omega driver control panel, I set both to Application Preference.)
If you're experiencing the stuttering movies, and you changed the anti-aliasing to 2 or 4, give this fix a shot.
-C