WordPress Taxonomies Search Filter
Taxonomies Filter Widget WordPress plugin creates a widget that acts as a filter for your WordPress categories, tags and taxonomies. Visitors will be able to do faceted searches on your site and filter posts using drop-downs, checkboxes and radio buttons. While built especially for sites with a variety of categories, custom taxonomies and custom posts (eg: shops, directories, tutorials, job boards or listings), this plugin will also do a great job at filtering the standard WordPress posts by categories, tags and even post format.
Link: http://codecanyon.net/item/taxonomies-filter-widget/4282257?ref=waylay