Copernic 2000
This is an excellent application for searching things on the net. Its the best search engines bundled into one mammoth of a search engine! You can search for keywords, shopping articles, email addresses etc. Its list of search engines features Yahoo, Altavista, WebCrawler, Infoseek, HotBot etc.
On the whole, if its on the net, you'll find it with Copernic 2000.