I agree.
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Sent from my Blackberry Wireless Handheld
In all seriousness I think it's worst with people that have an innate need to have their fingers into everything. The quick two liner almost is some sort of positive reinforcement to them that "I've processed this, and pronounced on this".
Blackberry etiquette is horrible for meetings. click-click-click-click-click-pause. click-click-click-click-click-pause. aargh!
Really, I guess it's no different from posters who jump on Internet Forums and habitually post "I agree" to threads.