This version adds multiple key=value check, which means that now you can have URLs like this:

<a href="http://yoursite.com/?s=anything&#038;key1=valueA&#038;key2=valueB" rel="nofollow">http://yoursite.com/?s=anything&#038;key1=valueA&#038;key2=valueB</a>...

<a href="http://yoursite.com/category/news/?key1=valueA&#038;key2=valueB" rel="nofollow">http://yoursite.com/category/news/?key1=valueA&#038;key2=valueB</a>...

I’ve also added autosuggest to the input fields in the Settings Page which will give suggestions based on the existing meta keys on your site.

Any ideas for an interface to construct such URLs are welcome (an advanced search box? etc).