My list of Some Useful Technical Books
DB Conversion charts, references, and tutorial.
The EIA Resistor color code explained.
Math Class - Some useful calculators.
Right triangle calculator
Interesting Facts and Factoids
A reference list of energy facts.
THESE ARE EXTERNAL LINKS!!
Here is a realy cool site: Windows on the Universe.
This is a Mars orbit animation, but make sure to visit their Home Page!! (Link in Lower left corner)
This is an incredibly handy Conversion program - Convert.exe from Josh Madison. It will convert most any unit to any other unit.
All About converting Thrust to horsepower
The Vintage Technology Association
A very fun site covering Vintage Technology. They especially like old tubes, and not the ones from your radio. Stuff Like Klystrons, and Gas discharge Tubes (Nixies). Check it out!