How hazardous are Wi-fi devices with their radiation?

Today I was reading about the radiation coming out of our cell phones - a topic that has been thoroughly discussed for a long time. I've heard a lot of stories that there is an electromagnetic radiation emerging from the headset, but nevertheless I am using my mobile without taking this that serious.

Well, I heard a similar story about Wi-Fi devices. I personally use the Wi-Fi coming with my notebook a hell of the time. Actually, I am used to hold the machine on my stomack, while I am in the bed. So normally, I got upset a little bit. I checked out the Internet for some information about how hazardous is the Wi-fi? I found this very interesting article, which shows a real lawsuit for exactly the same thing (check it out here). According to this article, it is well-known that Wi-fi's are harmful, but they are not more harmful than any other microwave that we are so used to. And even our wireless speakers and cordless phones sold everywhere are not "flowers", when it comes to radiation. Here is an excerpt from this article, which gives enough information about the case:

"
.. Wi-Fi experts argue that while wireless networks do, in fact, produce low levels of electromagnetic radiation, they emit no more than household gadgets do. If wireless networks are hazardous to your health, they say, so then is nuking a slice of pizza. Microwave ovens and many cordless phones actually operate at the same 2.4GHz frequency used by a 802.11b wireless network. Even those wireless speakers you can buy at RadioShack emit similar radiation levels. "At this point, we have no reason to believe there is any harm in wireless networks," says Wi-Fi Alliance Managing Director Frank Hanzlik.

...

In their lawsuit they assert that "responsible scientists have reported that prolonged exposure to low-intensity radio frequency radiation can break down DNA strands, cause chromosome aberrations and break down the blood-brain barrier, thereby permitting toxic proteins to invade the brain."
"

I am so used to my wireless router at home that I am 100% sure that I won't throw it away, because of this radiation. Actually, Wi-fi networks are getting more and more around us, and in general I find them really useful if not a-must. Wait a minute - do you know that Google is planning to build a Wi-fi network all across the States? Can you image in what hell of a problem they are getting into if the radiation coming out of the Wi-fi's is that hazardous? :-)

However, I guess that some sort to precaution is not bad idea, because as can be inferred from the article, it is still unknown what the damages of prolonged exposure to Wi-fi radiation to human are.