The eInk display on the Kindle makes reading very similar to a paper book. No or very little glare, and as the screen is not backlit it does not glow and give you the eyestrain that reading a computer screen does. The screen is very legible in direct sunlight, no glare at all. To read in the dark, you will need to provide a light (just like a book), and there are several manufacturers that make clip-on lights.
Some other pluses are that the font size is changable on the Kindle (and on some other eBook readers), and there is a text-to-speech function that can read the text to you.
Netbooks are basically small laptop computers with wireless web access, which provides a bit more functionality than an eBook Reader, but with the new models of eBook Readers (from Sony, IRex, and others) they are adding features like wireless web, touch screen, annotation and drawing, so the eBook Readers are starting to be less single purpose and more multi-purpose.
eBook Readers will continue to evolve, and as long as the major players stay in business (Amazon, Sony), and the file formats stay supported, then your actual eBooks will be able to migrate/transfer to the next generation of eBook readers.
Bottom line: with the Kindle, I find myself reading more because of having a portable device with lots of reading material at hand, and most importantly enjoying reading more.
