@Steve;
Yes...and no...
You are correct in the fact that the Oly's do not "shake" the sensor/filter assembly itself.  Oly uses an extra SSWF (Supersonic wave filter) that vibrates at several thousand hertz in the ultrasonic range.  This SSWF sits in front of the CCD and low pass filter assembly...so it still is possible for dust to eventually find it's way to the CCD/low pass filter.  Also note that the SSWF will not remove things like pollen or shutter fluid....both are known to make their way onto the filter assemblies.
I will agree with you that all that I have read about the Oly dust removal system has been POSITIVE...Your obvious experience with their product speaks volumes, and as I stated the rumors of sensor issues are unconfirmed...they probably came from a Canon guy...LOL!

And I will also agree with you about dust issues on Canon/Nikon DSLR's....I have loads of first hand experience...you are correct...it aint pretty!

Where I have to disagree with you is on the Sony Alpha...the subject of this thread.  The anti-dust system used by Sony is not the same one used by OLY...so, it is not their patent.

This is taken directly from Sony's site;

"Anti-Dust Technology.
Changing lenses in a DSLR can allow dust to enter the camera -- so to keep the CCD imager clean for better pictures, the Sony® α (alpha) DSLR-A100 camera utilizes both static-free anti-dust coating on the CCD filter and anti-dust vibration that automatically shakes the CCD to dislodge dust each time the camera is shut off."

 

So, here it clearly states that they are SHAKING the CCD....back to my original comment....I don't think that's something you want to do to your sensitve electronic components.

In youth, we learn....with age, we understand.