GNU Octave Wiki
GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation. Octave is normally used through its interactive command line interface, but it can also be used to write non-interactive programs. The Octave language is quite similar to Matlab so that most programs are easily portable.
The FAQ is a good place to start in this wiki.
The FAQ is a list of frequently asked questions (FAQ) for Octave users.
Octave Conference 2012
Planning for OctConf 2012 is under way. Newbies, experienced users, aspiring developers, and experienced developers are all encouraged to attend.