From the tallest skyscraper in the City of Brotherly Love to Canadian tourism copywriting brilliance, here’s what you should know from our -ist cities: This week, Phillyist took a gleeful listen to the White Stripes’ exciting new release, watched in awe as their new tallest skyscraper was finally completed, found a cheaper way to get to Gothamist, invented a tasty new dessert, and brought back their Craigslist Round-Up feature with a bang. Bostonist watches…