Heise.de Developer Channel published an updated version of my Arquillian article from last year. It now covers the new features from 1.0.0-Final and also introduces you to use the Drone Extension with Selenium to do some very basic UI tests.
arquillian.org for latest guides and how-to's to get you started in many many other languages.
If you still need more information check out the complete Reference Guide for the Arquillian project. Or the FAQ.