This week we've seen an excellent example of a common saying in financial market: "Buy the rumor, sell the news." I'm referring, of course, to the senate election of Republican Scott Brown in Massachusetts on Tuesday.

DirexionShares has already expanded its nascent stable of 3X ETF stallions. The initial crop of triple-levered trading vehicles tied to indices of financials, energy, and large and small cap stocks, have proven to be widely popular, as evidenced by daily trading volumes in the millions.

There has been a lot of discussion lately regarding the surge in volatile late-day trading that has occurred since the summer sell-off and fall credit-crisis began to unfold. In November alone, an average of 26.2 percent of trading volume in S&P 500 stocks took place in the final hour of trading, with 17.1 percent of the trading occurring in the final 30 minutes (see WSJ article).