Two new leveraged ProShares ETFs came on the market as of Thursday, 1/21/2010.  ProShares Ultra 20+ Year Treasury (UBT) and ProShares Ultra 7-10 Year Treasury (UST) both offer 200% leverage to the daily performance of their underlying long-term and intermediate-term Treasury bond indexes. ProShares already offered three leveraged and unleveraged ETFs tracking Treasury bonds on an inverse basis.   Proshares UltraShort 20+ Year Treasury ETF (TBT) has been particularly successful, attracting $4.6 billion in less than two years according to the ProShares news release . UBT and UST are the firm’s first long-side Treasury offerings.   The closest competitors are the 3X leveraged Treasury ETFs from Direxion…