Mail Trends lets you analyze and visualize your email (as extracted from an IMAP server). You can see: * Distribution of messages by year, month, day, day of week and time of day * Distribution of messages by size and your top 40 largest messages * The top senders, recipients and mailing lists you're on. * Distributions of senders, recipients and mailing lists over time * The distribution of thread lengths and the lists and people that result in the longest threads
Chris Anderson's blog about the shift away from mass marketing toward niche marketing, and the implications of this (and other effects of the IT revolution that make Long Tail possible) for the future of society.