(Undated)  --  Portland is in the top twenty of U.S. News & World Report's best U.S. cities in which to live.  The magazine ranks Portland 20th out of 100 cities listed, saying the its population tows the line "between an innocent playfulness and a shameless wild side."  It describes Portland as a "well-rounded city" with offbeat shops and events, along with museums, art galleries, and the oldest public library on the West Coast.  The U.S. News list of "Best Cities" is topped by Denver, with Seattle ranking seventh.