good things come to those who wait. For those of us not on whispernet here is the email I got from Amazon with the link to the software. Much prefer to get it from the source than some of these link published.
Natalie
Hello,
The most recent version of Kindle software is 2.5, as you're unable to update via Whispernet, you can update it through the below link.
You can download and install the updates manually by following the instructions on the Kindle Software Updates Help page:
http://www.amazon.com/kindlesoftwareupdates
The software updates page also includes information about the features included in the latest software update.