1.    I've found the website presented by the American Institute of Physics to be one of the best. The URL is http://www.aip.org/history/einstein/

There are plenty of other sites that are linked to this and you may find them interesting too, such as:

The biggest set of links: Albert Einstein Online by Steven Friedman
NOVA public TV's Einstein and his science with good explanations.
The History of Mathematics Archives gives A Short Einstein Biography with links to biographies of colleagues and forerunners, and brief descriptions of his theories.
A mini-exhibit on Einstein in Princeton
From Cambridge scientists, Relativity and Cosmology.
Einstein's Legacy in science, from the University of Illinois.
CalTech's Einstein Papers Project is publishing everything he wrote.
Listen to "Jottings of a Genius" about working on general relativity