Ian Dunn

<p>Redirects all HTTPS traffic to HTTP, except for specific exceptions. You might want to do this to minimize the number of times users would see an error if you don’t have a valid SSL certificate setup, or if you want to make sure that the delay SSL adds is only experienced when necessary.</p>


Force non-SSL

Redirects all HTTPS traffic to HTTP, except for specific exceptions

Fastmover

<p>A simple drop down selection meta box on a post edit page will allow you to specify default, HTTP or HTTPS.  Default will allow both HTTP and HTTPS protocols.</p>


Protocol Enforcer

This plugin allows a user to specify a post to only be viewed over HTTP or HTTPS.

Force non-SSL vs Protocol Enforcer