title: Magento - Retrieve products with a specific attribute value
body: <p>In my block code I am trying to programmatically retrieve a list of products that have a attribute with a specific value.</p>
  
  <p>Alternately if that is not possible how would one retrieve all products then filter them to just list the products with a specific attribute?</p>
  
  <p>How would I perform a search using standard boolean filters <code>AND</code> or <code>OR</code> to match a subset of my products?</p>