Say goodbye to Yahoo! Opera Mobile and Opera Mini will soon change its default search engine from Yahoo! to Google. Opera announced this news on their site and said Opera has established relationship with Google for years. ReadWriteWeb has a detailed analyze on the effect about Yahoo! losing the partnership with Opera. And since mobile internet is coming to our life and becomes popular this year, I agreed Yahoo! have a big lost for this.  Note Opera Mobile and Mini is a popular browser which is pre-installed in many mobile devices.