I think it's hard with a generic search page to get good results. Like other people commented if it appears in Wikipedia, MySpace, or Facebook those results will be first almost everytime. I built a page in javascript (http://www.bygsearch.com/) to aggregate & combine the results from Yahoo, Bing and Google which is sometimes better because of the quirks in each search engine. I was going to add some specific search verticals like /programming or /travel and combine results from different sources. Like maybe use github and google code in programming and combine with certain sites like stackoverflow while specifically blocking any result from experts exchange or a list of other crappy forums.