Amazon’s $79 Kindle may be the least flashy of the the bunch, but the Seattle company is starting to push out a new software update that adds some much-needed functionality to their cost-conscious e-reader.One of the biggest additions to the mix is support for Kindle Format 8, Amazon’s relatively new ebook file format. The $79 Kindle seems to be bringing up the rear in that respect, as the Kindle Fire, Kindle Touch, and most of the Kindle mobile apps have already been updated to play well with those newer KF8 files.