Go here right now and sign up for daily emails of all the free books for Kindle:
http://www.pixelofink.com/
Amazon has a free app every day so be sure and check that. You can keep all apps and books in the Kindle Cloud and not have them on the Kindle until you want to use them. If you download Print to Kindle to your computer you can send pdf files to your Kindle Fire. It's great to have quilt patterns with you when you find a great sale and want to buy fabric for patterns you have. Oh I just downloaded then new Stephen King novel for $1.99!