First surveyed (and mapped) by Napoleon Bonaparte's 1798 expedition, Amarna was first excavated in the late 19th century, and is currently being investigated by the Egypt Exploration Society and the McDonald Institute at Cambridge. Amarna is also the name given to the period in Egypt when Akhenaten reinvented the Egyptian religion.
Sources
The best source of information is the Tour Egypt site on Amarna, and the low tech but useful Amarna Research Foundation page, making anything I'd have to say redundant.
This glossary entry is part of the Dictionary of Archaeology. Any mistakes are the responsibility of Kris Hirst.


