The update will install automatically once the Kindle is on with the wireless radio turned on. Sadly my battery is dying already so I can't try this until I go home and charge it.... Looks like the battery life update applies to all Kindles of the "second gen" ilk (seemingly both the EVDO and the UMTS ones) and the PDF reader is good for all Kindles.The retailer says it made the battery improvements through a firmware upgrade that took six months to develop. As a result, Amazon claims that Kindles will get an 85 percent boost in battery life, lasting seven days with wireless turned on compared to four days previously. With wireless turned off, the Kindle will last up to two weeks on a charge, same as before.
Native PDF support will allow users to transfer files via USB or e-mail them to their "@kindle.com" e-mail addresses. PDFs can also be converted to the Kindle format by including "Convert" in the subject line of the e-mail.