Wall Street loves it when a company says it can keep a good thing going.

Witness Priceline, the Web travel firm that pioneered the "name-your-own-price" approach to booking travel online.

Jeffery Boyd, chief executive of the Norwalk, Conn.-based firm, gave what some analysts called a bullish and persuasive view of Priceline's prospects in Europe at a Bear Stearns tech conference in New York last week. That gave the latest boost to what has been one of the best-performing stocks of the year.

"I was really taken by the number of compelling points Boyd made about why Priceline's European business has legs for what may be years to some," said Standard & Poor's analyst Scott Kessler.

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