The PowerShares Lux Nanotech ( PXN) exchange-traded fund was one of Tuesday's best performers as Cambridge Display Technology ( OLED) 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) was also rising. Holdings InterContinental Exchange ( ICE) and Morgan Stanley ( MS) 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) ETF was recently falling 1.9% to $139.69. The iShares Dow Jones U.S. Oil Equipment Index ( IEZ) ETF was down 1.8% to $45.87. The SPDR S&P Oil & Gas Equipment & Services ( XES) ETF sank 1.4% to $30.29. The PowerShares Dynamic Oil & Gas Services ( PXJ) 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) ETF was recently down 0.6% at $36.21. Meanwhile, the SPDR Homebuilders ( XHB) ETF was higher by 0.1% at $34.03.