First of all, let me send out a big apology for not getting back about all of this. Rode to school one morning with the cell phone off and unfortunately still heard the popping noise. It happens with the radio ON or OFF while stopped or moving VERY VERY slowly (>5mph). It for some reason, though, is more noticable when the radio is playing.

Did some searching because I need to take my car back to the dealer to get some things done and ran upon this TSB:

TBS: 8-Jan-05 - 23-001-05 - Body - Popping Noise From Side Window Area

It's really tough to identify exactly where the noise is coming from but it sounds like somewhere behind me. So, does anyone have any more information on this TSB? It sounds to me like what i'm describing. I'm sure if I would take it to the dealership they would be "unable to duplicate the issue."

Again, sorry for this taking so long and not getting back to it. Thanks for any information.