"All computers which are connected to the internet are susceptible to infiltration and remote control. Computers which operate on a closed network may also be compromised by various hacker methods, such as privilege escalation, roaming notebooks, wireless access points, embedded exploits in software and hardware, and maintenance entry points." ..... from the Executive Summary of "Hacking Nuclear Command and Control" by Jason Fritz BS (St. Cloud), MIR (Bond)

And aint that the truth.

And it will take a quad core and still run like an 8088....

Please.. .A secure network does:
1) not hooked up to the WWW
2) not use IP as its protocol
3) not include unknown users
4) not accept outside non-secure media

Anything else is just more whacking off...

"criminals, terrorists, spooks, investment bankers, governments, marketeers and other evil-doers"

Hear, hear!

But let's not forget IT companies: Microsoft, Dell, HP, IBM, Intel...

"Darknets are overt, private computer networks used for ultra-secure communications and file sharing."

I wish them luck with that .... but would suggest that it is never going to work for information that clients need to be hidden and exclusive, and therefore ultra-secure is not virtually possible. Ultra-obscure though, is something completely different and much more effective?

But the browser idea is not novel, being a well betatested model ...... and there's a novel Quantum Communications BetaTest of Security Systems using the simple browser on your sister mag, the Register, this morning, although it has not yet appeared as a comment on .... http://www.theregister.co.uk/2009/07/22/britain_tech_jobs_boost/

No matter, it is easily browsed here ..... http://amanfrommars.baywords.com/2009/07/22/090722-from-russia-with-loveto-russia-for-love/