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I too have this problem (speed related rattle, passenger side). I think I've worked out why the problem seems to come and go. It only occurs when driving into still air. If I'm on a busy M-way with lots of traffic causing air turbulence, the rattle stops. But as soon as I hit clear air, it returns.
I've also noticed that most people on this post are (I think) driving non-turbo cars. I've noticed the inner n/s wheel arch has three cut-outs in the wing, each about an inch square (presumably designed for mounting something that's not fitted to the 325i). These cut-outs aren't blanked off in any way and I wonder of the air swirl from the wheel arch into the engine bay is making the plastic wing vibration worse.
Just a thought...
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