Ryan Street

Show or hide content with a simple to use shortcode system. You can access or restrict content for:
<ul>
<li>Logged in/out users</li>
<li>different user types, (author, administrator, etc.)</li>
<li>different user roles and capabilities</li>
<li>URL Keys</li>
<li>password entry (good to show teasers, etc)</li>
<li>show/hide clickable links</li>
</ul>

Content Lock

Show or hide some or all of your content by wrapping it in convenient shortcodes!

madeglobal

Better Protected Pages Plugin 
Compatible with wordpress 2.7 upwards 
Improve WordPress password protected pages 
Enable/Disable the included CSS file from within the plugin 
No need to edit any core files 
Adds a ?RE-LOCK? feature, so that you can lock a page when you are leaving 
Show the ?excerpt? from your page/post (or not ? setup in the admin area!) 
Graphics included, or make your own to match your theme 
Very flexible CSS so that you can easily tweak the layout to match your theme 
FREE to use (but you can donate if you want to)

Better Protected Pages

Improve password protected pages, with full control over CSS, wording and layout.

Content Lock vs Better Protected Pages