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They must or it'd be a waste of time and resources...something that Google is no doubt scarce of anyway :)
Why?
Knowing what 150 million queries are, by whom, from where, with what browser....etc
The Click-thru info that Google collects could IMO almost sum up "life on the Internet" and who uses it almost down to a T.
Funny one with the digi cams....at a guess either a backhander (of some sort ;) ) or its a metric for the algo. Of course, being an ethical engine it will be the latter :)
The code appears every now and then for probably almost everyone.
This digital cameras thing is the first I have heard of it appearing for every search.
As JayC said - there is no reason to believe this is being factored into the rankings - if Ihad to guess - I would say it is NOT.