Emails 'pose threat to IQ'
The Guardian brings results of a survey carried out at King's College, London University which essentially says that...
The distractions of constant emails, text and phone messages are a greater threat to IQ and concentration than taking cannabis
So, it isn't really email by itself, it's more the constant distractions that many of us have to face daily. As far as i have read, the survey does not mention PM and IM, recent post lists, or Google update threads. No mention of blogrolls, pings, trackbacks, comment spam either.
As for Cannabis, well, this article only says that the IQ in the test group had fallen amounting to "more than double the four point mean fall found in studies of cannabis users". It does not specify the source or accuracy of these other studies. So, next time somebody interrupts your concentration with a phone call or email message; either ignore it, or light up a spliff in stead of looking at it :-)
Sorry about pointing something that has already made a slashdot thread, but i this does sound relevant for the people here.