Previously, on the Development Blog:

We discussed the Yahoo! search API and how it doesn't seem to work for me. I haven't made any significant progress since then.

I was about to try anew to figure out how to apply filters to the Yahoo! search so we can offer section-level searches when I got an e-mail from Nick Heynen of the Wisconsin State Journal. Nick manages the online databases for WSJ and plays around with Internet widgets - in this case Google's custom search. At his suggestion, I gave it a try. It took 7 minutes to research and set up.

Here it is. It required absolutely no programming on my part.
Going one step further, Google also has an AJAX version, with all kinds of programmy potential. I haven't programmied it, yet, but here's that version. It doesn't have the section filters built-in. That's where the programmy comes in.