Exchange-traded funds tracking homebuilders were Friday's top performers. Late Thursday, former

Federal Reserve

Chairman Alan Greenspan said that the current housing slump may not worsen and might not subtract from gross domestic product growth.

The

iShares Dow Jones U.S. Home Construction

(ITB) - Get Report

ETF was higher by 3.2% at $37.04. The

SPDR Homebuilders

(XHB) - Get Report

ETF was adding 3% to $33.24. The

PowerShares Dynamic Building & Construction

(PKB) - Get Report

ETF was jumping by 1.2% to $15.72.

The

Internet Infrastructure HOLDRs

( IIH) ETF was also among the winners. Holdings

Akamai Technologies

(AKAM) - Get Report

and

VeriSign

(VRSN) - Get Report

were higher by 3.4% or more. The ETF was gaining 9 cents, or 1.7%, to $5.54.

Elsewhere, commodity-related ETFs were the worst performers following Thursday's strong advance. Gold futures gave back $6.70 to $630.10 an ounce and copper fell 22 cents to $3.09 a pound.

The

SPDR Metals & Mining

(XME) - Get Report

ETF was losing 2.6% to $47.20. The

Market Vectors Gold Miners

(GDX) - Get Report

ETF was falling by 2.5% to $38.91. The

streetTRACKS Gold Shares

(GLD) - Get Report

ETF gave back 1% to $62.31.

Bundled securities tracking energy were getting crushed, as oil dropped $1.57 in price to close at $59.59 a barrel. Among individual names,

Sunoco

(SUN) - Get Report

was down 2.1%,

Marathon Oil

(MRO) - Get Report

was losing 1.5%, and

Hess

(HES) - Get Report

was off by 1.4%.

The

Oil Services HOLDRs

(OIH) - Get Report

ETF was lower by 2.4% to $136.57. The

SPDR Oil & Gas Equipment Services

(XES) - Get Report

ETF was recently down 2.3% to $29.04. The

iShares Dow Jones U.S. Oil & Gas Exploration Index

(IEZ) - Get Report

ETF was losing 2.1% to $44.48. The

SPDR Oil & Gas Exploration & Production

(XOP) - Get Report

ETF was off 1.8% to $38.20.