The Swedish website "Prisjakt" - a website used for price comparisons - has a very nice set of form elements that dynamically update to indicate matching elements based on applied filters.
See link and/or attached image: http://www.prisjakt.nu/kategori.php?k=168&o=lokal_rank&rev=1#prodlista
Are there alternative (and even better) methods for doing what is shown in the image? (keywords: "filters with indicators")