Fidel Castro, whose dictatorship outlasted the nine U.S. presidents who tried to oust him, resigned today as Cuba's president. The frail, 81-year-old despot is being succeeded by his younger brother Raul, 76, potentially leading to the end of the decades-old embargo against the Communist country.

Though replacing one Castro with another one is hardly revolutionary, this could be a significant development. U.S. businesses have been frothing at the mouth for years at the idea of entering Cuba, the largest country in the Caribbean, with a population of more than 11 million. The island, which is about the size of Pennsylvania, has natural resources including petroleum, nickel and iron ore, according to the CIA's World Factbook.

Though Deputy Secretary of State John Negroponte told reporters that he doesn't expect the embargo to be lifted anytime soon, that position may not hold over the long-term because the Cuban market is too large for U.S. companies to ignore. You can bet that the Europeans and Canadians would love to expand their foothold in Cuba if America drags its feet.

MAJOR PAPERS:

• Barron's Magazine (subscription required) highlighted a number of possible M&A targets, along with a few stocks it believes to be undervalued:
• M&A is expected to continue in Europe: possible large cap targets include Barclays (NYSE: BCS), Deutsche Telekom (NYSE: DT), Deutsche Bank (NYSE: DB), ABN Amro (NYSE: ABN), Volkswagen (OTC: VLKAY), Koninklljke (NYSE: KPN) and Swisscom (NYSE: SCM); possible small-mid cap targets include Hellenic Telecom (NYSE: OTE).
  
• There may still be upside in shares of Xerox (NYSE: XRX), says James Benson, a partner and securities analyst at Harris Associates.
• Shares of YRC Worldwide (NASDAQ: YRCW) may be undervalued by as much as 50%, says Barron's "Bottom Line," which writes that shares could climb above $60.
• The Wall Street Journal (subscription required) featured an article on Pfizer's new CEO and his strategic plan.
• Pfizer's (NYSE: PFE) new CEO, Jeffrey B. Kindler, is preparing to detail his strategic vision for the company that will likely involve more job cuts.
• Hewlett-Packard (NYSE: HPQ) is claiming a nanotechnology research breakthrough that would bring big benefits in performance.
• According to a Nomura report, Sony Corp (NYSE: SNE) will reach only 75% of its global target for PlayStation 3 sales this fiscal year through March.
• The New York Times had an article highlighting the possibility of New York funding stem cell research.
• New York Governor Eliot Spitzer called for the passage of a $2B 10-year bond initiative for research and development, at least half of which would be set aside to pay for stem cell research.
• Citigroup (NYSE: C) may shorten its name to Citi and drop its umbrella logo.

OTHER PAPERS:

• The UK Times wrote that Ford (NYSE: F) may have trouble selling its Aston Martin unit after potential buyers found problems in the divisions books while doing due diligence.
• El Pais wrote that Fidel Castro is in "very grave" condition after three failed operations and complications from an intestinal infection known as diverticulitis.