For Kindle [And other e-Book] Users: Sources Of Free eBooks
I hadn't realised this until today and sorry if you were aware of it already but these links will take you to locations where you can download free eBooks:
Link 1: Amazon.com Bestsellers: The most popular items in Kindle eBooks
The right-hand column lists the top 100 free eBooks.
Link 2: Free eBooks - Barnes&Noble
Just what the link title says.
Also apparently iTunes allows for the download of free eBooks:
Link 3: Books - App Store Downloads on iTunes
I am unfamiliar with this site and I couldn't find any free items for download.
As always double check before downloading to make sure that the item you are about to download it is actually the price you expect it to be [free] before committing to getting it.