Targus was one of the first companies to ship cases for the iPad 2, so it's no surprise to see Slim Case for iPad (3rd-Gen) ($50) arrive immediately following Apple's announcement of the new iPad. Shown here with an iPad 2 for reference purposes, Slim Case is a standard folio-style design with a molded, hard rear shell and a leather-like polyurethane coating. The front cover -- equipped with magnets to lock and unlock the iPad -- folds underneath…