However, I would not use a Kindle for a pathology textbook or to read a pdf of a scientific paper. First, the screen resolution for pictures is only fair, and you will never get the detail that you need. Second, graphs and other figures are sometimes distorted because of the formatting. Third, while bookmarking is easy, it is difficult to jump back and forth.
The Kindle is a great product, but is would not be good for path books.
I disagree with the above. I have the Kindle DX (which is like twice as big as the regular kindle), and have many of the standard Path books in it.
A lot of these books are available in PDF format (look at your local medical library for a copy). The Kindle can display the PDF in ~85% of the native size while looking it vertically, and ~115% while looking at it horizontally (you have to scroll to see the whole page). The resolution of the image is actually excellent.
There are two main downsides to this approach. First, you lose the color. While this may be a big deal for a first year resident, if you already know somehting about the enitity you are looking up/reading about it is much less important. Secondly, archiving is a pain on the device, and if you have a 2500 page book (like the new Modern Surgical Path textbook) on a single file, it is very slow to turn the page, much less search for your specific query. You can change the format of the file to the Amazon format, which improves its funtion dramatically (you can have the device read the book to you, annotate, etc.) but this is only available on a small number of texts. The solution to this problem is to archive each book as a folder and each chapter as a separate book.
Using the above technique I have successfully added books such as Odze, Mod Surg Pathology, the entire Foundations series and WHO series, and others, into a single device. Now, if I'm at my desk and have those books handy, of course I will grab the book. But if I'm at home, or at a coffee shop or lab or whatever, I have access to all the same information. It is also good for just picking up and reading a chapter.
I agree though, that unless you have the DX version the above would not be worth it.