From the press release:
Diesel eBook Store ('http://www.diesel-ebooks.com') today announced the ability for their online browsers to download free eBooks directly from their website at 'http://www.diesel-ebooks.com/cgi-bin/gbooks/index.cgi'.Unlike many of its competitors the Diesel eBook Store has simplified the downloading process, in turn making it ultra easy and 100% hassle free for browsers to download free eBooks through a public domain partnership with Google Books without the requirement of any pre-existing software downloads. The free eBooks may be downloaded to a browser's computer, Smartphone or iPhone.
Yippee-skippee. If not for the fact that most Google Books are of such low quality, this would actually have been worth the work they put into it. Heck, it's barely worth posting about.