ETFs related to oil services were tacking on big gains, including the Oil Services HOLDRs ( OIH), which rose $3.67, or 2.6%, to $145.27. The move was driven by advances in Halliburton ( HAL) and Baker Hughes ( BHI). Elsewhere, the PowerShares Dynamic Oil & Gas Services ( PXJ) ETF was trading up 58 cents, or 2.9%, to $20.42, and the iShares Dow Jones U.S. Oil & Gas Exploration Index ( IEO) rose 98 cents, or 1.9%, to $51.52. Shares of the Internet HOLDRs ( HHH) were down 1.3% after First Global Securities said Yahoo! ( YHOO) would face pressure from rivals Google ( GOOG) and Microsoft ( MSFT) after a delay in an advertising system upgrade. The Internet Infrastructure HOLDRs ( IIH) ETF, meanwhile, was higher by 1.6%. Akamai Technologies ( AKAM), one of the fund's largest holdings, was trading up $1.49, or 4.1%, to $38.08. The iShares Dow Jones US Basic Materials ( IYM) ETF was gaining 72 cents, or 1.4%, to $53.53 as Phelps Dodge ( PD) surged 7.5% following a Prudential upgrade. Fellow holding Peabody Energy ( BTU) jumped 7.6%.