Janos Ver

This plugin will enable you to
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Create Reading Groups and associate them with users and private posts and private pages
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Once these users logged in they will see those private posts and private pages which you granted access to
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Publish your posts and pages to general public as usual
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Your users will not be aware (unless you tell them) of what Reading Groups they are part of (if any).
Translations
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Hungarian – Janos Ver (last updated for plugin v1.9)
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Czech – TomKom (last updated for plugin v1.9)
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WP JV Post Reading Groups

Thank you. Your work really saved me a lot of time. Thanks again

Very good

Easily create posts and pages visible only for selected users of your blog

basvd

Note: This plugin does not work in WP 2.5. The AJAX referer check in WP 2.5 does not conflict with a hardened version of PHP, so this plugin is no longer adequate. 
If you still experience the permission problem it is likely your browser or a plugin.
This plugin fixes an issue that can cause several problems in the Administration Panel, including the following:
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<li>The “You don’t have permission to do that” error when performing certain actions, even though you are in fact logged in</li>
<li>The “Are you sure you want to edit this page: “”?” confirmation when trying to save a post or page</li>
<li>Inability to remove pages or posts using the Management panels</li>
<li>And possibly other problems that have similar symptoms</li>
</ol>
Most people who get these problems seem to be on a server that uses a hardened version of PHP. This version adds several security measures to PHP, including transparent cookie encryption. The WordPress function that checks whether you can perform certain actions in the Administration Panel (<code>check_ajax_referer()</code>) does not function properly because of this. This plugin replaces that function with a something that does take the cookie encryption into account.

AJAX Referer Fix

Fixes a problem that causes "You don't have permission to do that" errors. It replaces the pluggable check_ajax_referer() with a safe a …

WP JV Post Reading Groups vs AJAX Referer Fix