I am a Gmail man myself but my wife, her family, and most of my friends are still using Yahoo Mail. My feeling is that it is still relatively popular.
If you are a Yahoo Mail user, the Digital Squad has done you a favor by listing out some tips and tricks.
Trick: Instant Address Book Add - Drag a message onto the Contacts link and you'll see the icon change to a plus sign which means you can add that contact to your address book in one easy step.
Top 11 Yahoo Mail Tips and Tricks by Download Squad [via Digg]
