Password Protected Blogs

You can try .htaccess password protection.

https://www.askapache.com/2006/htaccess/htaccesselite-ultimate-htaccess-article.html

https://tools.dynamicdrive.com/userban/

Depending on how many user accounts you have .htaccess would be an ideal solution because it runs on the server and is supported by all clients, even mobiles.

This
htpasswd plugin is still beta but it will be able to use wordpress login information automatically.

But I do believe you can use .htaccess to accomplish that today if you want. I would recommend this.

1. deny access to all files except the login page
2. redirect all 403 denied to login page
3. then allow access from all users that successfully log in by checking for the present of a cookie using mod_rewrite

Hey wait thats a good idea!