Soul Identity by Dennis Batchelder is now available for $0.01. This is is $10.20 in paperback and has several reviews, all three stars or above (and enough of them that it probably isn't just the authors friends and family). The premise looks interesting and it's currently the #1 seller in the Technothrillers category at the Kindle Store. 
by Dennis Batchelder is now available for 
and $0.01 edition of this book? The file sizes are different and often that means that there is a difference in covers or one is topaz format and the other mobi (topaz files are often larger, due to the embedded fonts). However, with this book, the more expensive version is 50% longer: 6868 locations instead of 4352 (they end the same). It could be just a formatting difference (on the first page, the chapter heading is left justified on one, right on the other, but otherwise, they seem the same for the first few pages). I've emailed the author and will let you know what I find out. Synopsis
You can't take it with you...but what if you could? Most people believe their souls outlive their bodies. Most people would find an organization that tracks their souls into the future and passes on their banked money and memories compelling. Scott Waverly isn't like most people. He spends his days finding and fixing computer security holes. And Scott is skeptical of his new client's claim that they have been calculating and tracking soul identities for almost twenty-six hundred years. Are they running a freaky cult? Or a sophisticated con job? Scott needs to save Soul Identity from an insider attack. Along the way, he discovers the importance of the bridges connecting people's lives.
Update
I contacted the author about the two versions and the different file sizes and location counts. I had wondered it perhaps one version was abridged, since there was quite a difference. Seems he checks his email fairly often even on weekends and quickly sent back this reply (reprinted with his permission):
the background: both books were uploaded back in november 2007 from the same
mobipocket creator-produced file. the dollar version is sold directly by
amazon ($0.99 is the least they'll list a book for), and the penny version
is sold through mobipocket.com ($0.01 is their minimum). both companies are
owned by amazon, so they both publish into the kindle market.
i went through the penny and dollar versions, and the words are the same:
all the chapters are in both, and there is no adbridging going on.
so why the location problem? here's what i've noticed: the penny version
shows 9-10 "locations" per page, and the dollar version shows 18-20
"locations" per page. this explains the discrepancy how amazon shows the
size bars.
Dennis Batchelder
So, we know that not only were at least two copies of his book sold today (although he is out a penny one one of them), but that everyone else that grabs up this bargain is getting the full book. I suspect the author makes a few cents more on the Amazon version, but if you enjoy his book, you can always help him out by spreading the word (or buying a print copy for a friend that doesn't yet have a Kindle).
Just we we think we have locations figured out, it seems that they still don't quite mean what we think, if two different mobi versions of the same book can be off so much in the location count. If you've been using location counts to compare the "thickness" of books, much as you would measure the spine size on your bookshelf when deciding what to read next, it seems that they really can't be used in that manner. Since not every book comes with a "page count" (which is often from the paperback or hardback version of the book), we are left without any real method of telling how "big" a book really is.
