Inbox Zero is a topic path well-trodden in the productivity blogosphere, but two books and a few blogs about personal productivity later, staying on top of my email is still a daily challenge for me. While I don’t get down to zero every day, I do get there once or twice a week–usually when my inbox overflows onto the next page. (In Gmail, that’s when I get past 50 conversations.) Over at my Harvard Business blog, I ran down my tried and true techniques for keeping the electronic mail under control. If you’re suffering from a severe case of overload or could just use a refresher, check out Extreme Makeover: The Email Inbox Edition.