Scott,

I must confess to being slightly uncomfortable with this. Yes, it's a potentially useful resource. Yes, many authors may find it a useful way to showcase their books. But read the "About" page:

For Authors and Publishers

Our revenue comes from selling your books. We hope that you are pleased with our efforts, but if you are not, you may request we remove your book from our indices. Please contact author relations at the address below.

This site appears to be copying substantial chunks of copyright books, then retrospectively offering the authors the opportunity to opt out - no, not even that - to request to opt out. They are doing this for commercial gain. Although some authors will share in that gain, there is no obvious way that their share will be in any way related to the number of people who download their code.

I've no idea how they do things in Oregon, but in the UK, where I have a passing acquaintance with copyright law (IANAL!), I don't think this site would survive very long.