The Idiot - Plain text file at Project Gutenberg. - http://www.gutenberg.org/etext/2638
Literature Network: Poor Folk - Chapter indexed HTML of the complete text. Includes a search feature and author biography. - http://www.online-literature.com/dostoevsky/poor_folk/
Classic Bookshelf: Fyodor Dostoevsky - Etexts of The Brothers Karamazov, Crime and Punishment, The Gambler and Notes From The Underground, with adjustable sized text and automatic bookmarking. - http://www.classicbookshelf.com/library/Dostoevsky/