What Yahoo has and Google hasn't:

[boron]

http://tools.search.yahoo.com/about/forsearchers.html

Yahoo Answers (http://answers.yahoo.com/): ASk anything and wait for answers from others.

Yahoo Audio (http://audio.search.yahoo.com/)

Yahoo Video (http://video.search.yahoo.com/video?ei=UTF-8&p=) is much better then Google video.

Yahoo Site Explorer (http://siteexplorer.search.yahoo.com/) shows backlinks almost in real time, Google updates backlinks with PR update only.

[Chris369]

Was gonna say there is a Google Answers but seems they have stopped it now.

[Submerge]

games.yahoo.com

Google sure is missing that key factor.

[boron]

Yahoo Pipes (http://pipes.yahoo.com).
Came out recently. RSS feeds in a new way.