Ricardo Pinheiro has published a series of really cool Zentyal HowTos at Mundo TI Brasil in Portuguese. These help you to configure Zentyal as a gateway, DC, add Windows 7 to the domain, use RSAT with Windows 8.1 and to manage users and groups. Check them out! Guia de instalação do Zentyal 3.4 Zentyal – Configurando um Gateway (DHCP, DNS, …
How To: Zentyal 3.0 – Joining PCs to a Zentyal Domain
In this video tutorial by The Jonas Technology Site you will see how to join Windows 7, Windows 8, and Ubuntu Desktop to a Zentyal 3.0 domain.