Here's a snippet of my referrer logs:
Ever wonder what NET CLR 1.0.3705 in your referrer logs means? So did I.
I found out that it's the version of the .Net Framework Internet Explorer (IE) has installed on the computer looking at your page.
Thanks to Google I learned how to change this string to whatever I want.
I wrote up a page on Changing IE Agent Strings as a reference for others.
There has got to be other cool hacks of the agent strings and other data that is passed to web servers by browsers.
Let the fun begin...