Suvuda.com are offering free books to download on their site. To take a look at their free library, go here
I'll be checking out a few of them myself. I'll be keeping an eye out for what else they add.
Edit: Tried to download one of the e-book versions earlier. Sony's e-book library software apparently isn't supported in the UK or Ireland though, so I'm screwed out of that. Less than pleased with having to read any of those titles off the damn computer screen.