For a peek into the life of an antiquarian bookseller, check out Bookman's Log. It is a blog by the author, and owner of Ten Pound Island Book Co., Gregory Gibson.
Gibson is based in Gloucester, Massachusetts. His focus is on "old, rare and out of print books, manuscripts and charts pertaining to the sea." Lots of interesting stuff here about the finding of valuable old books, the inner workings of the bookseller business, the place of books in contemporary culture, and the lovely/odd/informative/fascinating objects themselves (with photos!).
His post from March about whaling logs might be of interest to the Marathoner.