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.
> Yahoo also reported Monday that it's writing down $482 million in charges related to the declining value of Tumblr, the social-blogging service that Yahoo acquired for $1.1 billion in 2013. Combined with an earlier write-down of $230 million, that indicates Tumblr's value has plunged by almost two-thirds.