Expansion of the leveraged ETF menu continued this week with the (7/14/2010) launch by Direxion of long and short 2x sector ETFs for the Retail and Natural Gas sectors.  Direxion now offers a total of 38 leveraged ETFs, according to the firm’s press release. The new funds are:Direxion Daily Retail Bull 2x Shares (RETL) (overview page)Direxion Daily Retail Bear 2x Shares (RETS) (overview page)Direxion Daily Natural Gas Related Bull 2x Shares (FCGL) (overview page)Direxion Daily Natural Gas Related Bear 2x Shares (FCGS) (overview page) RETL and RETS are benchmarked to the Russell 1000 RGS Retail Index, which consists of the Russell 1000 constituents from the retailing sector.  Top holdings include Wal-mart (WMT), Target (TGT), Home Depot (HD), Lowes (LOW), Amazon.com (AMZN) and about 40 others. FCGL…