Alexa: http://www.alexa.com is a site that generates estimates of a domains popularity and reach. Very much an estimate, because it is driven by a toolbar that has to be installed.
View: 1 View is a person looking at a page one time.
Readership: Is a repeat visitor who comes back on a regular basis.
Traffic Source: Is some outside area that provides incoming traffic normally through a link.
Crap Content: http://evilbeetgossip.film.com/
Keyword Lookup: inventory.overture.com gives you a nice way of seeing volume on keywords. Double the number for google, that is what I do.