Charles Darwin online:

About 90,000 pages of manuscripts, field notes, photographs and sketches connected with Charles Darwin are being placed online, where they can be viewed free. Among the gems are his first formulation of the theory of natural selection, his first written doubts that species were fixed and touching correspondence from his wife on religious faith.

The huge set of documents and images is part of the Darwin Online project, based in Cambridge, which claims to be the largest Darwin bibliography and manuscript catalogue created. Many of items were previously available only to scholars with access to the Cambridge University Library.

The project began in 2002 and this is the last major set of additions. Dr John van Wyhe, Darwin Online's director, said: "[The documents] have been known to scholars, but for the first time they are available to everyone for free online."

Here's the website for the Darwin Online archives. (Via Marginal Revolution.)