Larry's comment reminded me that a few days ago, I saw what looked
like a "borrowable" method of implementing site-specific searches,
on the Celestron site. I've gone back, grabbed their "search" page,
substituted "Project Pluto" for various places where they had "Celestron",
and... lo and behold... it appears to work. (Basically, it just passes
the search off to Google.) I can recommend this solution to anyone
faced with the problem of adding a "search this site" capability.
It's almost disgustingly easy to do.

If you go to the main Project Pluto page and click on the "search
this site" option (just under the main grid), you'll see what I did.

Thanks for the nudge, Larry.

-- Bill