little wrapper over moment.js to turn it into a jquery plugin for relative times.

gistfile1.coffee

$.fn.relativize = (format='MMM D, YYYY at hh:mma') ->
    for date in this
        $date = $ date

        if $date.attr 'unix_timestamp'
            this_moment = moment.unix $date.attr 'unix_timestamp'
        else
            this_moment = moment $date.text(), FORMAT
            $date.attr 'unix_timestamp', this_moment.unix()

        $date.text this_moment.fromNow()