If you are looking for anything to do with global aviation, aerospace, and defense industries then AviationWeek.com has just launched a search engine for you.
Bill Hartzer, writing for SearchNewz, discovered the launch information. So now I know where to go if I get work in that area.
The growth of vertical search engines has been extensive this year, but one has to ask wouldn't Google have the information regardless of the fact that they do not niche. When you have a good chunk of the web in your database it comes down to how well you can filter for the niched search queries.