Spigen SGP is back at it again with the newest version of its Steinheil Ultra Optics Screen Protector ($29), this time for the third-generation iPad. Like previous versions, the sheet of film comes packed alongside a cleaning cloth and solution, dust removing tape, and a squeegee. Installation is rather easy, and once its in place the protector combines the features of anti-glare and crystal films thanks to the the "microlens" setup. It's completely…