“And when you’ve finished that batch of email responses and are ready to return to your work? Close that email client, friend! Don’t open it back up until you’re ready to dedicate your attention to it again. Otherwise, it’s just a distraction. I find it useful to set times for checking my email throughout the day, for instance 10 a.m., 1:30 p.m., and 4 p.m.”
http://alistapart.com/column/my-life-with-email
Some good tips here. Email is one of those deceptively simple things that everyone misuses.