BBC’s Sikhism page gives a good, introductory overview of the religion as well as Sikh news and information on the Sikh community in the U.K.
The SikhNetwork: a sleek, fun site with news, chat rooms, events listings, downloads of Sikh wallpaper and music and even its own singles service for marriage-minded Sikhs.
The Sikh Times is a no-frills, but impressively thorough site that compiles global news and analysis on issues of interest to Sikhs.
Sikhe.com: global Sikh daily news and current affairs with original columns and editorials debating issues within Sikhism.
Sikh Mediawatch and Resource Task Force (SMART): a resource, activism, news and mediawatch site for American Sikhs.