laceous

Due to lack of interest (both my own and based on the number of downloads) this plugin will not be updated for WP 3.0
WordPress’ auth cookies include a built-in expiration date (either 2 or 14 days depending on if the ‘Remember Me’ option is checked). Even if you remove the client-side cookie (by manually logging out or just closing your browser if ‘Remember Me’ wasn’t checked when logging in) the data that was stored within the cookie is still valid until the expiration date is reached.
This could be an issue if someone managed to “steal” your cookie(s). They would still be able to access your website for some time into the future.
This plugin will immediately invalidate your auth cookies when you manually log out. This, of course, also means that you have to manually click ‘Log out’ for this plugin to work properly (you can’t just close your browser to remove any cookies that expire at the end of the session). This won’t prevent session hijacking, but should limit the amount of time that an attacker can access your website.

Invalidate Logged Out Cookies

This plugin will immediately invalidate your auth cookies when you manually log out.

nagarjunsonti

My Login/Logout plugin With this plugin you can now add a real log in/logout item menu with autoswitch when user is logged in or not.it works both Custom menubar as well as Default menubar.We have a flexibility to set custom redirect pages for login as well as logout. 
it works both custom menu bar as well as defult menu bar
<h4>Extra Functions</h4>
1.The user has a option to set the custom redirect pages from selecting the drop down lists from admin page. 
2.The user has a option to set the custom url as a login redirect page.

My Login Logout Plugin

My Login/Logout plugin With this plugin you can now add a real log in/logout item menu with autoswitch when user is logged in or not.

Invalidate Logged Out Cookies vs My Login Logout Plugin