We have resolved the issue with users not being able to sign in to the Safari Books Online mobile site from the Kindle3. This issue is that the K3 browser doesn't accept XHTML or XML inputs.
If you notice anything else, please send me an email,
nwerner@safaribooksonline.com
@Bsalita - Amazon doesn't have an early release program, so we wait in line just like everyone else, and hope we get it quickly!
- Nic.