The

PowerShares Lux Nanotech

(PXN)

exchange-traded fund was one of Tuesday's best performers as

Cambridge Display Technology

(OLED) - Get Report

rose 7.3%. The ETF was higher by 31 cents, or 1.8%, to $17.16.

The

B2B Internet HOLDRs

( BHH) ETF was also higher, as

Ariba

( ARBA) was gaining 2.8%. The ETF was climbing 3 cents, or 1.5%, to $2.09.

The

iShares Dow Jones U.S. Broker-Dealers

(IAI) - Get Report

was also rising. Holdings

InterContinental Exchange

(ICE) - Get Report

and

Morgan Stanley

(MS) - Get Report

were recently up 1.3%.

The ETF was adding 20 cents, or 0.4%, to $52.53.

On the flipside, energy-related ETFs were among the worst performers of the day. The front-month April contract, trading for the last time, was losing 22 cents to $56.37 a barrel.

The

Oil Services HOLDRs

(OIH) - Get Report

ETF was recently falling 1.9% to $139.69. The

iShares Dow Jones U.S. Oil Equipment Index

(IEZ) - Get Report

ETF was down 1.8% to $45.87. The

SPDR S&P Oil & Gas Equipment & Services

(XES) - Get Report

ETF sank 1.4% to $30.29. The

PowerShares Dynamic Oil & Gas Services

(PXJ) - Get Report

ETF was off 0.7% to $20.16.

Bundled securities tracking homebuilders were mixed following key economic data. Before the opening bell, the government said U.S. housing starts jumped 9% in February to 1.525 million annualized units, retracing some of January's 14% drop. However, building permits eased 2.5% last month, disappointing some economists

The

iShares Dow Jones U.S. Home Construction

(ITB) - Get Report

ETF was recently down 0.6% at $36.21. Meanwhile, the

SPDR Homebuilders

(XHB) - Get Report

ETF was higher by 0.1% at $34.03.