Last Sunday must have been Mark Twain day in the Washington Post.
Three reviews are available online:

A Legend Sold Down the River
on Lighting Out for the Territory
http://washingtonpost.com/wp-srv/WPlate/1997-03/09/029L-030997-idx.
html

Two Fathoms Deep
on Inventing Mark Twain
http://washingtonpost.com/wp-srv/WPlate/1997-03/09/028L-030997-idx.
html

Book Report
on The Oxford Mark Twain (after a section on how used books are now
sold on the web)
http://washingtonpost.com/wp-srv/WPlate/1997-03/09/037L-030997-idx.
html

Jim Zwick