Brookhaven National Laboratory: Scientists Determine Age of New World Map: Press release concerning a U.S. government lab's finding that the Vinland Map predates Columbus's arrival in North America by almost 60 years.
NPR : Is the Vinland Map a Fake?: Report on recent C-14 and chemical analysis conducted to determine whether or not the oldest known map depicting North America is genuine. Includes related links.
Vinland Map and Shroud Updates: McCrone Research Institute discussion of scientific studies of the validity of these two artifacts.
Vinlanda: The Vinland Map on the Web: Tim Spalding assembles links to Net resources on the so-called "Vinland map", allegedly depicting Viking activity in North America.