Complete works of Charles Darwin Online

A fantastic resource that makes available some of the key texts of Victorian science, and some extremely fine writing. (See for example: The formation of vegetable mould, through the action of worms, with observations on their habits.)
http://darwin-online.org.uk/

Radio 4 is serialising extracts from The Beagle Diary this week. If you have missed the first episode you can always listen again:
www.bbc.co.uk/radio4/arts/book_week.shtml