WassUp is a Wordpress plugin to track blog visitors in real time. It has a very readable and fancy admin console to keep tracks of blog's users visits.
It has a "current visitors online" view and a more detailed "visitors details" view where admin can know almost everything users are doing on the blog, it's very useful for SEO or statistics maniacs and it has a "Spy" view in Ajax like the Digg Spy.
The aim of WassUp is the knowledge of what the visitors do when they surf the blog. With WassUp you'll get a cronology of your blog's visits with a lot of details for each single user session and some charts.
These details are provided for information only. No information here is legal advice and should not be used as such.