I'll start with the Kindle bestsellers. The free bestsellers are in the list on the right, but if you also look on the left, you'll see many books for under $5. Did you know you don't even have to have a Kindle in order to read these free books? Amazon has reader apps for many different types of devices. You can download that HERE--free.
A new development on the CHEAP Kindle front is a Kindle Daily Deal. This changes (obviously) every day, so bookmark this page.
Another new list! Amazon also has a list of the top Kindle books for $3.99 and under. While they aren't free, it's nice to have a good cheap list to work from once you've downloaded and read EVERY free book there is. (Is that possible?)
On to the free music... You can start here on the bestsellers list. The top 100 free downloads are in the list on the right. Some are singles, and some are entire albums. Find your favorites, or try out some new artists. When it's free, anything goes.
Don't forget the cheap MP3s for the month. Since this is a free post, I'll just post the link to the October $5 whole album downloads.