It wasn’t much if a surprise that Amazon announced the Kindle Fire HDX, but the Kindle Fire HD, at $229, is indeed unexpected. It’s got a similar construction to the 7-inch HDX, but inside it packs a 1.5GHz dual-core processor, and a brand new OS, nicknamed “Mojito.” It ships out on October 2nd, and represents Amazon’s best bet for reviving the Kindle line. Whether or not it’s enough to save the Kindle – whose sales haven’t exactly been stellar – remains to be seen, but it’s clear that many companies are trying to get their cheaper tablets out ahead of Apple’s early-October blitz of new hardware and software.