Closing weekend at Jackson Hole Mountain Resort featured plenty of sunshine (at least on Saturday) and the sounds of ski bum music. Jackson Hole real estate activity: NEW: Ponderosa Village 2-bed, 644-square-foot condo in West Jackson built in 1976 is now the second-least expensive home in Teton County, listed by Jackson Hole Real Estate Associates for $275,000. NEW/BACK ON MARKET: Melody Ranch...