The HTML and PDF versions of the manual can be found here.
The ArangoDB package consists of a server, a separate shell, which allows you to administrate the server, and a set of client API (or sometimes called drivers) for various languages including the Big-P (PHP, Python, Perl) and Ruby.
Please contact us if you have any questions.
Though ArangoDB is yet a young project, a couple of people started to add APIs for different programming languages/frameworks. See http://www.arangodb.org/drivers.
Frank is twittering for the project on Twitter using @fceller. We've also a "generic" twitter account mainly for announcements called @arangodb You can also subscribe to a low traffic announcement list on the connect page.