Engineering Toolbox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Highly Recommended
HyperPhysics - an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation. For the most part, it is laid out in small segments or "cards" that are interlinked for easy navigation.
International Temperature Scale of 1990 - Temperature Scale and General Temperature information for metrologists, scientists, calibration engineers and those with an interest in the temperature scale and its realisation.
Progressive Engineer - Progressive Engineer is an online magazine and information source featuring stories on engineers, companies, and engineering projects written in an easy-to-read style and a job board and directories of engineering firms, organizations, and schools.
Sensor Land - The site for sensors and transducers to measure acceleration, angle, flow, displacement, load, pressure, proximity, shock, speed, temperature, strain gauges, torque, vibration, calibration, weighing.
Thermal Wizard - This is a great heat transfer calculations and material thermal properties resource. Highly Recommended
World of Science - A great math and science resource on the internet. Highly Recommended