Off-hand: Yahoo Fantasy Sports is very popular, considered by many to be the best online fantasy sports site. Yahoo Finance is popular. Yahoo Mail has a lot

Off-hand: Yahoo Fantasy Sports is very popular, considered by many to be the best online fantasy sports site. Yahoo Finance is popular. Yahoo Mail has a lot of people who would do anything to continue using it. Digging around a bit, here's what they consider to be their "core services" that are getting their focus lately: Search, Mail, Tumblr, Sports, News, Flickr, Lifestyle and Finance. You can argue more about some of those than others.