iShares Barclays 20+ Year Treasury Bond ETF (NYSE: TLT ) Treasuries made new year-to-date highs last week after stock market volatility forced investors to take shelter in long-duration bonds. TLT has now gained 24 percent this year after many economists predicted that 2014 would be negative for bonds on the back of rising interest rates. TLT will be a key indicator to watch for signals of risk-taking behavior through the remainder of 2014. iShares Silver Trust (NYSE: SLV ) Silver prices have been crushed this year as a rising U.S. dollar and tepid inflationary statistics have pressured commodities.