Bundled with United SGP's Steinheil screen film, plus film flash diffusers and -- oddly -- an Apple logo protector, Ultra Silke R for iPhone 4 ($20) is a rubber case that's a little stiffer on the back than on the sides, which are soft and just a little floppy for something that's going to go in and out of a pocket. Silver-painted button guards and fairly tight tailored holes are found on the top, bottom, and sides; multiple colors as always are available.…
