Some of the more recent innovations in technical analysis come from researchers involved in the study of stock market cycles.
Peter Eliades periodically writes for Barron's. One of his Barron's articles "Sign of the bear" is a must read, and is free on his website, shown below. Eliades identifies periods of "churning" in the Advance/Decline line which presage sharp market declines.
The Advance/Decline line periodically and reliably signals market breaks.