It might deserve a newspost of its own, but I'd like to have a working server running so people can actually, you know, use it. Unfortunately, I haven't thought to get node running on my VPS before now, and it's almost 02:00 here...
Holy crap, I had an extremely similar idea last month for a bookmarklet that let you machine gun and blow up pages. In fact, it's sitting half complete in a projects folder. Erkie, get out of my head!!!!
At least it's open source, so I guess I can fork it and add in my ideas.
Though, it appears he was trying to implement high scores, which would send some information to another site, including document.location.href, but it is commented out in the version I linked, and removed in the minified version.
(lol, seriously though, it highlights "real" login fields based on domain for the page/frame which can't be spoofed and does a one-click login rather than typing it in - you can't get "fooled" because you should never be typing anything)
If you load up, say, 6 instances, hold the up button for a while to get them up to full speed, then turn for 4 or 5 seconds and let go, they'll be a bit divergent, but not too badly. They should all be going roughly the same direction, and wrapping around at roughly the same time.
If you load up 6 instances again, hold the up button for a while, and then turn back and forth very rapidly for a short period of time, they'll be much more divergent.
Here is an example that will search hacker news (via google). This is based on the wikipedia example: