My problem with Search Engines just now is that you need to know what you want before you can use the engine. And I don't know what I want, and I suspect that neither does my audience.
I was put off a specific Engine recently when I got zero hits no matter what keywords I searched for. I am still trying to define the keywords within Cinderella.
I think Search Engines are great if you have a massive and rapidly changing population of information.
Yahoo just does a better job than I can at the moment.
TTHUSC uses searches into Deja Vu very constructively.
Maybe all I can do is what I do now, and that is to point to the good Engine sites. Maybe I should think about giving tips on how to get great info.