Only if you're buying them from Amazon. There are plenty of wonderful texts available in the public domain, and already formatted for the Kindle: http://manybooks.net/
That's actually why I placed my order: I won't abide by the DRM, which will force me to read older works to get value out of the device. A goal I've had since reading a quote dubiously attributed to Einstein: "Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else."
That's actually why I placed my order: I won't abide by the DRM, which will force me to read older works to get value out of the device. A goal I've had since reading a quote dubiously attributed to Einstein: "Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else."