What doesn't this Widget search?!?!

Spare but elegant interface, accurate results. There's even a link for an extensive inline help page on the back.

And it's free. What's not to like?

It might be cool to have a means of refining search results--say, by having the widget load results and then offer another search parameter. That would likely mean a lot more work, though, since the developer would have to customize the refinable search process for each site. And there are lot of sites accessed by this widget, folks.