The MasterKey Widget Set provides the easiest possible way to enhance an existing web-site with customised searching across multiple sources, ranking and merging the results.
All you need to do is pull in our JavaScript and optional stylesheet, then add <div>s to your page that have special id attributes. We do the rest.
Here is a completely functional (though ugly) MKWS-based searching application:
<script type="text/javascript" src="http://mkws.indexdata.com/mkws-complete.js"></script> <div id="mkwsSearch"></div> <div id="mkwsResults"></div>
That's it. A complete metasearching application. Everything else is refinement.