[matthew]

There's an interesting comparison over at Pixinfo reviewing the effectiveness of the sensor-dust removal from Canon, Olympus, Pentax, and Sony.

http://pixinfo.com/en/articles/ccd-dust-removal/

The conclusion: keep your blowers handy.

[NT73]

Very interesting, and there I was thinking the 400D would be better than the 350D. I know in some areas it must be but.......... I think I will stick.

[shuttertalk]

Wow, great find Matthew, and very surprising result! It sounds like the Canon, Pentax and Sony cleaning systems are hardly effective at all!