There are at least two sites that offer a daily entry from Thoreau’s journals: “The Blog of Henry David Thoreau” at http://blogthoreau.blogspot.com/ and “This Date, From Henry David Throeau’s Journal” at http://hdt.typepad.com/
I have “This Date” bookmarked, but ” the Blog” is nice, too, and they haven’t (so far as I’ve noticed) overlap in entries. A little bit of Thoreau is great; a nice addition to one’s reading of the news and the rest of the more ephemeral content of the web. Though I suspect that Thoreau might wonder why I’m reading his remarks on the natural world instead of going out and experiencing the world myself…
I myself have never been able/wanted to keep a journal (“Know Thyself” is not one of my watchwords) but I like reading other people’s journals. I have all of Virginia Woolf’s Diaries, but haven’t read most of her fiction, for example. No one seems to be doing her diaries on line yet, and I’m not volunteering (I wonder if they are still under copyright?). I think one of the first web efforts was “The Diary of Samuel Pepys” at http://www.pepysdiary.com/ which has been going on for years and is now in 1666. That’s a major undertaking, and a very elaborate site, with a lot of annotation, “in depth articles” etc.