The short explanation (from jgc's post): "jsHub is a single piece of JavaScript (a "tag") that can handle reading different sorts of page information and then

The short explanation (from jgc's post): "jsHub is a single piece of JavaScript (a "tag") that can handle reading different sorts of page information and then send them to many different vendors' products. One piece of code to send to Google Analytics, Omniture SiteCatalyst, WebTrends and Mixpanel."