I tried a little "homemade" something last night. I live in Western Michigan so we experienced the "Blizzard of 2011" last night, 45mph wind gusts and all. I went to Menards and purchased some all purpose weather stripping. It's maybe 1/2 wide and sticky on the back side. I heated the adhesive side with a hair dryer so it would stick to the weather seal in the door. I placed it over the existing seal from the side mirror to the bottom corner of the driver side door and also the same with the rear passenger door. I took it for a test drive (up to 60+mph) and absolutely no wind noise when the wind was gusting toward the driver side of the vehicle. I was so happy; convinced I had fixed the issue. So I then turned around and headed back to the house - ughhh - the whistling started up again - only when the wind was gusting towards the passenger side of the vehicle. It was extreme conditions last night, I haven't ventured out yet today but will update once I do. I'm convinced it helped a ton because I heard zero wind noise for the most part.