For the last week or so, I've been slaving away over the hot manuscript (Barnum's Revenge). On Friday, knowing I had a busy weekend ahead, I decided to hold off answering emails until today.
I've just about finished wading through over 450 emails. About two-thirds of them were Yahoo group or Twitter-based, but there were more than enough regular emails to keep me busy for hours.
In future, I'll make sure I keep on top of things.