don's home on the internet  

Computer/Science/Math:
SETI@Home - Help find aliens using your computer’s spare time.
Open Source Development Network and Microsoft, both useful choices
Recycled VAX 11/780
Programmable calculators past and present from Texas Instruments
Old computer resources:  Old-Computers.COM and
Blinkenlights Archaeological Institute
Slide rule pages:  1, 2, 3, 4, 5

The web wayback machine: browse all the way back to that "ancient" year of 1996 :)

Neal Stephenson's  awesome essay, "In the Beginning was the Command Line"

Some clever developers at SGI developed the idea of using a Lava Lamp as a random number generator

Crypto pages:
 Simon Singh's web page – Page for the author of The Code Book, a fantastic crypto overview
American Cryptogram Association

Get PGP in the US or outside
RSA Laboratories
Counterpane
The Pros:  The US’s NSA and the UK’s  GCHQ