Relyt, great post bud. Gotta love the jargon people love to flind around these days. But of course, you won't be able to see this post because according to most online security tests, not only am I stealthed, my computer doesn't exist, and I'm actually edger allen poe.
Seriously though, one site that opened my eyes was Gemal/Browser Spy . Browsers transmit a wealth of information that people don't know or don't care to know. There is a neccessary evil out there called javascript. Ask the common user what is javascript is, and they'll most likely respond "is that the stuff I get in my email junk box?" Even with my nice little NoScript! add-on to firefox, this site can still determine a fair amount of information about my computer. So, the solution seems simple...disable javascript and anything else that reveals information about your computer!. Sure. Using that logic, If I want to avoid getting speeding tickets, all I have to do is take the wheels off my car!.
In all seriousness though, it's irritating that sites are duping people into thinking they're safe when they're not or that they're invisible, etc. I'm glad you brought it up. If people want stealth, I suppose they could use a proxy but even then, it's not true stealth. Maybe a wifi enabled laptop, a car, and a MAC spoofing program?. I don't know.
I guess my only advice for people who want true stealth is to use some kind of IP configuration program, release their IP and *poof* they're stealth! NO more IP!
....no more internet connection either but, let's not get too technical

Btw, for those of you who want to have fun. You can use the add-on User Agent Switcher to send false information to sites you visit. I believe it only works with FireFox and Mozilla though. Originally intended to increase functionality, it's still fun to see some sites comes up with incorrect information about your computer. (By messing with a couple fields, I was able to trick a few sites into reporting that I was using Windows 98 and Opera).