I have been keeping a running list of search engine possibilities. MyGodSearch is a somewhat newer one that claims to search over 2000 web sites. It's basically a Google custom search that "searches religious and web 2.0 sites, for educational and ministry work." It also has a Delicious Tag Cloud search that has plenty of helpful categories.
Here's my running collection of search engines that I find useful.
For some other specialized search engines, here is a list of 13 sites for finding such things as music, videos, recipes, quotes, and more.