I don't normally mention websites here on "tip of the day," but will mention Archive.org as there is a great deal of free material on this site.
I found five scanned books from Hancock County, Illinois, on the site. These books can be viewed as text files (there will be some OCR errors), PDF, DjVu, or FlipBook files. The amount of material on here is amazing. The fact that I can download entire county histories is just amazing.
The viewer options here put Ancestry.com to shame. For more information view www.archive.org