Amazon.com: Help > Using Your Account > Signing Out:
Signing Out
If you are using a public terminal, you will want to log off, or sign out, before you leave the computer. Here's how:
1. Click the link near the top of the home page that says 'If you're not (your name), click here.' tricksters.
2. On the next page, leave the e-mail and password spaces blank and click the Amazon.com tab at the top of the page.
3. Close the browser to prevent your name or 1-Click settings from appearing on the public terminal.

that's what I thought. they don't want you to think of it as a session so no logout button. they want you logged in all the time. tricksters.
rg: finally someone is talking about this. this whole amazon 'if you are not maria' thing is the elephant in the internet room.
refined version: elephant in the web.