90 years in the making, the 21-volume Chicago Assyrian Dictionary is finally complete. The full set is $1995, or free PDF downloads. If you can wait a little longer, the Chicago Hittite Dictionary will be complete in 2045 (begun in 1975), while the Pennsylvania Sumerian Dictionary has no completion date. [more inside]
Knowledge and Power in the Neo-Assyrian Empire may sound like a dry website, but its subject and content is fascinating. In the 7th Century BC King Assurbanipal of Assyria built a library that was to contain all the world's knowledge. Destroyed by the Medes in 612 BC, the library was not rediscovered until the 1840s. 28000 clay tablets written in Akkadian have been found. 1600 can be read online, all translated into English. It's a somewhat overwhelming amount, but there's a lovely highlights section, which even includes pictures of the pillow-shaped writing tablets. For a thorough overview, you can listen to the In Our Time episode about the Library of Nineveh. The most famous text to have been found in Nineveh is undoubtedly the Epic of Gilgamesh. The story of its decipherment and the controversies that ensued, is interesting in its own right.
Mesopotamia at the British Museum.