Ancestry.com regularly posts items on their website that are "in the clear". In other words, you don't have to have a subscription to access them. However, these free databases are often difficult to locate, as they are scattered amongst many other databases that are not free. These databases typically don't stay free, but change as Ancestry's promotions change.
Now Clear Digital Media, Inc., best known for their Interment.net site, has posted a new site entitled Free On Ancestry.com. It's a portal to Ancestry's free databases. Check it out at: