eBooknewser reported today that Amazon quietly shut down Mobipocket, an ebook store that those of us with PDA roots probably remember fondly. Amazon purchased Mobipocket and still uses their format as the basis for Kindle books. After reading the post, I headed over to Mobipocket and found what appears to be the internet equivalent of a broken, abandoned storefront. There’s no announcement that Mobipocket is gone, but the files appear to have all disappeared. Bestsellers, fiction, non-fiction, everything is just gone, with the exception of a handful of classics that appear on the main page. Meanwhile, things aren’t exactly hopping…