The first resource that I am grateful to have for homeschooling is not free, but it enables me to access many free items. I love my Kindle! I can access many classic books for free, and it is easier to read them on the Kindle than on my ipod. This summer I read The Five Little Peppers and How They Grew,which was free on the Kindle, to my girls as our bedtime reading. I have downloaded Herodotus for a taste of early histories and the New Oxford American Dictionary for vocabulary study, as well as numberous classic books.
Yes, the Kindle is pricey, but you can purchase the wi-fi Kindle with Special Offers and Sponsored Screensavers for $114 or the 3G + wi-fi Kindle with Special Offers and Sponsored Screensavers for $139. If you can put up with the advertising that comes with the price break, this seems to be the way to go. I wish they'd had this offer available when I paid full price for mine. If you just can't bring yourself to pay for another electronic device, many other devices (like the ipod, iphone, ipad, and other tablets) have a Kindle app available for download.
If your taste runs more to contemporary novels or a packaged curriculum, this device may not help you tremendously in your homeschooling, but if you are integrating classics into your high school curriculum or just want to expose your younger ones to books like Little Women, Anne of Green Gables, or The Five Little Peppers, the Kindle is as much fun as a trip to the library.