BookLamp "is a system for matching readers to books through an analysis of
writing styles, similar to the way that Pandora.com matches music
lovers to new music. Do you like Stephen King’s It, but thought it was
too long? The technology behind BookLamp allows you to find books that
are written with a similar tone, tense, perspective, action level,
description level, and dialog level, while at the same time allowing
you to specify details like... half the length. It’s impervious to
outside influences - like advertising - that impact socially driven
recommendation systems, and isn’t reliant on a large user base to work."