The wiki page tells a little about different editions of the old book. Grimms' Fairy Tales - Wikipedia, the free encyclopedia
You can download some on Project Gutenberg Household Stories by the Brothers Grimm by Jacob Grimm and Wilhelm Grimm - Project Gutenberg
(just one selection, I haven't downloaded them yet.)
And if you're really into this folklore/fairystories here's a webpage starting with the brothers Grimm that has more to offer to. Read Brothers Grimm fairy tales online!