Review for 100 Search Engines for Firefox by Rafael
Rated 5 out of 5 stars
Some other search engines you might add http://www.altavista.com/ http://www.lycos.com/ http://www.yebol.com/ http://www.vadlo.com/ http://duckduckgo.com/ (brazilian ones) http://www.mercadolivre.com.br/ http://www.achei.com.br/
To create your own collections, you must have a Mozilla Add-ons account.