Finally I found what ate my iPhone battery for lunch. It was the Push function of Exchange. Turned it off and set it to fetch at a 15 minute intervall - battery life back to (iPhone) normal. Still far from the capacity of the Nokia E71 though. Apparently there is a bug in firmware version 2.2.1 in the Exchange push function that consumes the battery at an alarming rate since there are several pages on the 'net describing exactly this problem.
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