Safety of 802.11b/g cards

I've been surfing the web on the safety of 802.11b/g cards. I wonder
what people's thoughts are re. the following points. Admittedly, they
are taking the worse-case view, and I'm not making any pretense at a
"balanced guess".

* Many discussions on exposure deal with Watts/area, which is is more
applicable to irradiation "far" from the source (e.g. from a base
station)

* Near to the antenna (say, on the mobile unit), the exact positioning of
the antenna and the human limb can result in nonuniform power levels
across the user's limb

* Most information is for cell phones (900MHz)

* Some information claims that the exact frequency is not important, but
2.4GHz (for 802.11b/g) is much more likely to be absorbed, since water
absorbs at that frequency

* Laptop users will likely spend much more time beside their wireless LAN
cards than cell phone users do on calls, quite possibly by more than 10x

* Some information says the human appendage should be at least 2 inches
from the 802.11b/g card. For some laptop card slots, there is 0 inches
between hand and card, and barely 2 inches to the antenna. This might
indicate a preference for USB attachments for wireless LAN, which
protrudes out the back, away from the hands. However, the greater
protrusion also makes it more susceptible to snapping off, and possibly
damaging the laptop.

* Only dealing with Watts/area (and absorption rate by the human body) is
based on the fact that all the frequencies of interest are nonionizing.
However the recent correlation of cell-phone usage with a very rare kind
of brain cancer indicates that it may not be as simple as heating (even
though the cancer is so rare that it was not worried about -- didn't take
down reference, sorry).

Fred