If you're a reasonably advanced SEO don't read this unless you want to get really annoyed, it makes some rather bold statements that overlook a lot of the reasons around why the current state of the art around good URL design is where it's at:
http://googlewebmastercentral.blogspot.com/2008/09/dynamic-urls-vs-static-urls.html 
"There is no limit on the number of parameters"

It also rather contradicts this:
http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=35769 
"If you decide to use dynamic pages (i.e., the URL contains a "?" character), be aware that not every search engine spider crawls dynamic pages as well as static pages. It helps to keep the parameters short and the number of them few."

However in all the confusing verbage the post contains about Static vs Dynamic URLs there is a good point at that Juliane Stiller and Kaspar Szymanski seem trying to get across, although it's certainly not very obvious. That is, that if you use dynamic URLs which are split up in the standard name=value pair format, and one of the values changes frequently for instance it is a session ID, it's easier for them to spot it and automatically remove that variable from the URL string. With a static string this is much harder to do.

That's all good advice, however good URL design should take account for this, and of all the URLs I could find that contained a SESSID , a good chunk of them look like they are dynamic anyway?