Not bad for generic advice. More about AoM than email, but, hey.

a breakneck consideration of email and twitter, adding social signals, and @mentions

advice based on tech writing principles

More shifts in the language - this time at the rhetorical level and owing as much to "productivity" as mode of delivery: "While short snappy emails and short snappy replies might come across as curt, research suggests that such messages lead to the highes

summary post concerning "email makes you stupid" media reports of 2005.

media matters - to ethos and pathos. the media of a paper letter carries with it rhetorical statements about the sender, and about the relation of sender to audience. It's part of a rhetorical contract.