The K3 can't directly talk to another Kindle via WiFi because it doesn't support adhoc WiFi networks. If you have a WiFi access point available then they'd be able to communicate via WiFi.
The Amazon Whispernet network have proxy servers which prevent access to anything which isn't web. The web sites available may be limited depending on what region you're in i.e. it might be Wikipedia and Amazon only.
If you suddenly start hammering the 3G connection because you've tethered it to a laptop or desktop then Amazon are most likely going to notice and do something to stop you since you're not meant to do that.
Your ideas have a general theme of paranoia along with destruction of civilisation or the planet. Have you thought of reading more upbeat books on your Kindle?
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