Mike Schinkel

NewClarity

This plugin does what it names says; it omits page templates from the parent theme from the template dropdown when you are editing a “Page” in the WordPress admin.

Omit Parent Theme Page Templates

Omits Parent Page Templates from the "Page" edit screen in the WordPress admin.

Alexis J. Villegas

This plugin will automatically generate a page-specific widget area that replaces the content of the page when selecting the ‘Widgetized Page’ template. Requires the Genesis Framework.
You can add support for <a href="http://my.studiopress.com/documentation/snippets/structural-wraps/add-structural-wraps/" rel="nofollow ugc">Genesis structural wraps</a> when using the ‘Widgetized Page’ template along with the full-width Genesis page layout option. The following example shows how you can implement this on your theme:
<pre><code>// Add structural wrap to page widget area section
add_theme_support( 'genesis-structural-wraps', array( 'header', 'footer-widgets', 'footer', 'site-inner', 'page-widget-area' ) );
</code></pre>

Widgetized Page Template

Tested both plugins and no issues so far.

Nice

Automatically widgetize any page when using the Genesis Framework.

Omit Parent Theme Page Templates vs Widgetized Page Template