ETFs related to oil were among the best performers Friday. Crude prices spiked after the National Hurricane Center said a tropical depression headed toward the Gulf of Mexico may be upgraded to tropical storm status. Oil for October delivery rose 74 cents to $73.10 a barrel. The iShares Dow Jones U.S. Oil & Gas Exploration Index ( IEO) was higher by 1.5% to $50.83, the PowerShares Dynamic Energy Exploration ( PXE) ETF was gaining 1.1% to $19.75, and the Energy Select Sector SPDR ( XLE) ETF was up 0.8% to $58.21. In addition, other commodities were trending higher as well. The iShares Silver Trust ( SLV) ETF was higher 40 cents, or 0.3% to $124, while the streetTRACKS Gold Shares ( GLD) ETF was up 11 cents, or 0.2% to $61.86. The B2B Internet HOLDRs ( BHH) ETF was trading higher as holding Checkfree ( CKFR) surged 5.7%. The B2B Internet HOLDRs was up a penny, or 0.5%, at $1.97. Financial ETFs were uniformly lower. The Regional Bank HOLDRs ( RKH) ETF was losing 0.9% $152.86. The iShares Dow Jones U.S. Financial Services ( IYG) ETF was lower by 0.8% to $121.22. The streetTRACKS KBW Bank ( KBE) was recently losing 0.8% to $55.35, and the Vanguard Financials VIPERs ( VFH) was down 0.5% to $58.98. The iShares Dow Jones U.S. Aerospace & Defense ( ITA) ETF was falling by 0.7% as Boeing ( BA) was down 1.8% to $73.88.