The update is for what Amazon calls the "Kindle Keyboard", which is actually the K3. For those with the K3, this upgrades the software from version 3.1 to 3.3. You can either go here to get your update or wait for it to be delivered wirelessly. I usually manually download these updates, since I never seemed to get them when others do. It may also have something to do with not having my wireless continuously on.
Enhancements or fixes from this update include:
--Download your archived Personal Documents on Kindle Keyboard: You can now view and download your archived personal documents to your Kindle Keyboard conveniently anywhere at any time. Your personal documents will be stored in your Kindle library until you delete them from the Manage Your Kindle page at www.amazon.com/manageyourkindle.
--Whispersync for Personal Documents on Kindle Keyboard: Just as with Kindle books, Whispersync automatically synchronizes your last page read, bookmarks and annotations for personal documents (with the exception of PDFs) across the Kindle devices. Learn more about Kindle Personal Document Service on www.amazon.com/kindlepersonaldocuments.
--AmazonLocal deals - Kindle Keyboard with Special Offers users in many regions can now view, purchase and redeem AmazonLocal deals directly from Kindle Keyboard - no computer, no printer, no hassle. AmazonLocal offers savings up to 75% off products and services from businesses in your city, national chains and online merchants. Learn more about AmazonLocal on www.amazonlocal.com.