DailyLit is a fantastic service — they take public-domain and Creative Commons-licensed books and email them to you, one page per day. They put my novel Someone Comes to Town, Someone Leaves Town up last year to great response, and now they’ve added a whole slew of science fiction, including the rest of my novels and my latest short story collection, Overclocked, and many other sf books including Charlie Stross’s Accelerando, Flatland, Frankenstein, From the Earth to the Moon, and The Time Machine.
(Thanks, Jeff!)