Just in case a constantly increasing unread messages counter isn't providing enough details about the flow of messages to your inbox, the Official Gmail Blog has pointed out the Gmail Meter tool for detailed monthly activity breakdowns. A Google Apps script developed by Romain Vialard, it can show you stats on volume, daily traffic, traffic pattern, email categories, time before first response, word count and thread lengths; providing an even deeper dive than Google's own Account Activity dashboard.
2DayBlog.com, Gmail Meter brings detailed analytics to your inbox
