You can find information & resources of science, biotechnology, chemistry, ecology, technology, science resources, mechanical engineering, earth sciences, astrophysics, nuclear & molecular at PortalScience.com
GeoClio
history of geology and the geosciences.
http://geoclio.st.usm.edu/
Greatest Engineering Achievements of the 20th Century
the top twenty achievements in terms of their impact on the quality of life, chosen by the National Academy of Engineering and its collaborators.
http://www.greatachievements.org/
History of Science Society (HSS)
dedicated to understanding science, technology, and medicine and their interactions with society in historical context.
http://www.hssonline.org/
Institute and Museum of History and Science - Florence, Italy
collection includes the apparatus and scientific instruments of the Medici and the Lorenese collection of instrument and didactic and experimental devices.
http://galileo.imss.firenze.it/
Lateral Science
providing coverage of unusual science and engineering topics, projects, and a CD-ROM of scanned vintage science books.
http://www.lateralscience.co.uk/
timelinescience
provides a unique way of exploring how our way of understanding the world has changed in the last 1000 years ? from unquestioning religious belief to scientific rigour.
http://www.timelinescience.org/
Today in Science History
features births, deaths, and events in the history of science, invention, and technology.
http://www.todayinsci.com/