Comparisons of metasearch engines:
We worked on an Information Request this week trying to find specific facts about the Green Parrot Snake which lives in Central and South America. It took us a while to find exactly what the patron wanted, so I thought I'd do a simple search in these search engines.
Dogpile -
Seemed to bring just as many commercial sites selling green snake products as it did informational info.
Mamma -
Less commercial sites showed up in the results, but very little informational sites came up. Most of the results were sites which just provided photos.
Rollyo -
Had a few more informational sites than than the other two.
So in this case the best search was Rollyo.
However I would still use Google, since these 3 didn't give that many results, and I kept feeling like I was missing the really good stuff that Google and the other Google products find (Scholar, Books, etc.).