Waldo & Henry: A Dialogue allows you to be the proverbal fly on the wall in an exchange between Emerson and Thoreau. Well, maybe a fly on the paper, as some of this material is taken from their actual writings.
Emerson: A Visionary Life is actually the main site to the above link, but worth listing on its own. Though it appears to be under construction, it has a great deal to choose from including some non-traditional resources.
Heat Wave in Concord is a poem by Robert Chute published in the on-line Benoit Poetry Journal.
See the ground-zero of Thoreau's inspiration. This rich Walden Pond State Reservation site is not an "official" site, but so much the better (it's actually a part of the Lincoln community Website).
This writer and Louisa May Alcott buff has a really wonderful, passionate and personal site devoted to LMA. Definately not ordinary!
The University of California at Santa Barbara Library let us know when their Henry David Thoreau site went up. It is part of a project devoted to collecting the lost or nearly-lost work of this author. Also, they have a part of the site devoted to Walden (not quite a lost or almost-lost work).
From the Univeristy of Texas comes another site from a Concord devotee dedicated to the authors now of Sleepy Hollow: Emerson, Thoreau,
Hawthorne and Alcott.
Part of the handsome "I Hear America Singing" Website devoted to profiles of artists, movements and ideas includes a biography of sculptor Daniel Chester French.