Sikhi & Sikh History Resources
Sikh Research Institute – Sikhi-related articles, videos and resources as well as exciting projects and events
Sikh Rehat Maryada
in Punjabi: from SGPC website
in English: SGPC version GND version
Sikhs.org – information about Sikhi and Sikh history
Gurbani.org – interesting articles and blog posts about gurbani
SikhiWiki – encyclopaedia about Sikhi which anyone can add to
BBC iWonder – The Gurus and Warriors of the Sikh Kingdom (timeline)