ETFs related to oil services were among the strongest performers Thursday, as crude rebounded from six-month lows. Oil was recently up 44 cents to $61.18 a barrel, having reached an intraday low of under $60 a barrel on Wednesday.

The

Oil Service HOLDRs

(OIH) - Get Report

ETF was adding 1.7% to $124.56. The

iShares Dow Jones U.S. Oil Equipment Index

(IEZ) - Get Report

ETF was gaining 1.5% to $40.48. The

Energy Select Sector SPDR

(XLE) - Get Report

ETF was higher by 1.3% to $51.55.

In addition, other commodities were moving to the upside. The

iShares Silver Trust

(SLV) - Get Report

ETF was recently up $2.62, or 2.4%, to $111.48, and the

iShares Comex Gold Trust

(IAU) - Get Report

ETF was tacking on 68 cents, or 1.2% to $57.98.

The

PowerShares Lux Nanotech

(PXN)

ETF was one of the worst losers Thursday, due to a 24% plunge in holding

Nucryst Pharmaceuticals

( NCST). Shares fell after the company announced a trial for its eczema cream failed. The ETF was lower by 36 cents, or 2.1%, to $17.18.

The

Internet Infrastructure HOLDRs

( IIH) ETF was also trading lower. Late Wednesday, holding

InfoSpace

(INSP) - Get Report

warned about revenue, dropping the shares by nearly 21%. The ETF was down 13 cents, or 2.4%, to $5.36.

Retail ETFs followed

CVS

(CVS) - Get Report

,

Walgreen

(WAG)

and

Rite Aid

(RAD) - Get Report

lower after

Wal-Mart

(WMT) - Get Report

introduced a pricing plan for substantial discounts to generic drugs. CVS dropped 8.7%, Walgreen fell 6.7%, and Rite Aid lost 6.3%.

The

Retail HOLDRs

(RTH) - Get Report

ETF was falling by $1.86, or 1.9%, to $96.88. The

PowerShares Dynamic Retail

(PMR) - Get Report

ETF was recently lower by 26 cents, or 1.4%, to $17.82.