These Animated Search Engine Bot Crawl Visualizations are the result of a one year experiment on the behaviour of Yahoo, MSN & Google search engine bots.
You can click on the pictures to watch the animated visualizations from drunkmenworkhere.
MSN Bot Visual Animation
Yahoo Slurp Visual Animation
Google Bot Visual Animation
Definitely worth further study.
Quick Conclusion – For Google shorter URLs help rankings & comment spam does hurt rankings.
For you SEO types wistful for the days of chasing the green fairy, there is even a graphical visualization of pagerank in their test matrix.
The paths are similiar to natural forms. That fits with the idea that evolution is efficent search leading leading to winning forms. Perhaps we will find that the closer advanced visualizations resemble natural forms, that the visualization improves and/or the engines become.