Nice to hear that visitors was useful :) and sure Graphviz is very cool, it was a great help in our startup (the main product we developed is a digg/reddit/...-alike system for the Italian market) in order to visualize voting patterns and try to improve the algorithm for fraudolent voting patterns detection.

LLOOGG is still pretty raw and we are developing the "filters" part of the UI, but still it seems pretty useful to check what's really happening in a web site. We have a lot of success stories of people using LLOOGG for some week and then modifying the site structure to optimize the user experience.

Thanks for the comment.