Terry Chan's Chinese Martial Arts
Various articles and links about Chinese internal martial arts.

World Tai Chi & Qigong Day
List of events worldwide, medical research information, FAQ, mail list and organizing kit.

Internal Strength Magazine
An online version of the newsletter published by Mike Sigman from July 1993 to May 1994 offering commentary and articles related to martial arts using "internal strength".

HealthWorld Online Qigong and Taiji
In depth resource on qigong and taiji (chi kung and tai chi). Articles on guidelines for practice, choosing your path, practices, online forums.

Wikipedia - Nei chia
Overview of Nei Chi, internal Chinese arts. Details on the history of the term and styles that are a part of it.