I agree with Boosty. Why take it in when it'* something you can fix yourself. Here'* the procedure for removing the door panel.
Once the door panel is off, you'll see a dark grey or black plastic panel, which is the water deflector. It'* job is to keep water that enters the door from entering the car. Around the outside of that is a sticky rubber seal. That is what generally causes the problem. It comes loose on the bottom. If it'* in good shape, sometimes just pressing it back on with do it (dry things well first). However, as you've had this problem before, head off to the dealer and pick up a tube of sealant for it.
From your description, that or the weatherstripping (which has not been much of a problem yet for the 2000+) is your problem.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.