Maybe this is well known already, but click over to ManyBooks.net. They have alot of classics (Poe, Lovecraft) and pulp (Robert E. Howard, Burroughs) and just a great selection of free downloads. Over 19,000 titles according to their website. You get your choice of formats as well. This is awesome news for me. I prefer a real book, but I travel alot so this is a really cool option for me.

Credit goes out to MojoNexus, he linked At the Mountains of Madness eBook in another post that I read yesterday.