Actually, that is a very sensible question, and Amazon have anticipated it with a "Read Online" capability.
http://www.amazon.com/gp/digital/sit...ar=0&details=1
However, that wasn't exactly what you were looking for.
Incidentally, when your Kindle 2 arrives, it will also read books in PRC/mobi format. We have a fair number of free public domain titles in philosophy and religion in our upload section. You may want to check it out. (Go to the blue bar towards the top of this page and click on "ebooks".) Also try a tag search in the search option on the blue bar.