The NASDAQ just announced it was changing the trading symbol of QQQQ back to QQQ (QQQ charts and Quote) effective immediately. Bob Brinker's long-term subscribers remember QQQ well. In fact, if they followed his advice to the letter, then they are still holding a large percentage of their portfolios in this fund well below their purchase price over a decade ago!
The last time Bob Brinker raised cash and lowered his asset allocation from 100% in equities was in early 2000 when he went from 100% equities to 35% equities and 65% money market funds.
For the rest of the story, see Powershares QQQQ Reverts Back to QQQ