Exchange-traded funds tracking the Internet sector were among the top performers of Friday's session, thanks to a potential blockbuster deal for Internet giant Yahoo! (YHOO). According to the New York Post, Microsoft (MSFT) wants Yahoo! to enter formal discussions for what the report said could be a $50 billion deal. Yahoo! was surging 18.4%.

Among other Internet names, Amazon.com ( AMZN), RealNetworks ( RNWK), eBay ( EBAY) and Time Warner ( TWX) were all higher by 2% or more.

The Internet HOLDRs ( HHH) was the best performer of the day, adding $3.21, or 5.3%, to $63.62. The First Trust Dow Jones Internet Index ( FDN) was climbing 58 cents, or 2.3%, to $25.34. The Internet Infrastructure HOLDRs ( IIH) was gaining 9 cents, or 1.8%, at $5.15.

The HealthShares Emerging Cancer ( HHJ) ETF was another of the day's winners. Shares of Dendreon ( DNDN) surged nearly 12% ahead of the Food and Drug Administration's expected May 15 ruling on the company's Provenge drug.

The ETF was recently up 72 cents, or 2.7%, to $27.30.

On the other hand, housing-related exchange-traded funds were among the biggest losers of Friday's session. Among individual names, Beazer Homes ( BZH) dropped 2.4%, Pulte Homes ( PHM) slumped 1.6%, D.R. Horton ( DHI) was losing 1.1%, and Toll Brothers ( TOL) eased 0.8%.

The iShares Dow Jones U.S. Home Construction ( ITB) ETF was recently falling by 49 cents, or 1.3%, at $36.54. The SPDR Homebuilders ( XHB) ETF was down 36 cents, or 1%, to $34.57.

Bundled securities tracking oil and gas services were also higher, despite a dip in crude prices. Recently, the front-month June contract was down 17 cents to $63.02 a barrel. Crude oil prices have now fallen more than 5% since last week's close.

The Ultra Oil & Gas ProShares ( DIG) was adding $1.33, or 1.5%, to $88.33. The SPDR Oil & Gas Equipment & Services ( XES) ETF was recently up 48 cents, or 1.4%, to $34.76. The Oil Services HOLDRs ( OIH) ETF gained $1.75, or 1.1%, to $162.95.

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