The danger is definitely there with compressed air. The propellent can exit the can if you don't keep the can level (shooting at an angle will almost always lead to something exiting the can!!).
In the case of the D30, I found that by holding the D30 with the opening facing slightly downward and keeping the compressed air can level - I could dislodge dust and let gravity help ensure that things didn't end up deeper in the camera.
That said, I haven't even considered that for my 10D!!
The specs in your photos are the same kind I've encountered.
I'm about to try and get rid of a spec I have - I'll be your guinea pig! I'll let you know how it goes...
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