http://getclicky.com/ is my favorite.
How is it any different?
It looks like the differentiator is a visitor-centric view? Plus more flexible and customizable data?
I run a few membership websites and being able to see visitor's usernames and track their actions that way is invaluable.
GA does a number of things that Clicky doesn't, but the opposite is also true, as you can see by the handy dandy matrix you mentioned.
Disclaimer: I am the developer. :P
The matrix isn't that helpful, though. It's pretty big and uses a lot of clicky-specific phraseology.
For the above URL, it cuts it down to http://www.abc.edu/
Of course, we normally log full referrers, even dynamic ones, so you can see the actual sites linking to you. It's not such a big issue more recently, but it used to be nearly every tracking service would cut out the query parameters, making referrer tracking not very useful.
I suggest adding a column to the chart on the Learn More page that says that.