Yahoo! Mail Beta

Few months ago, Yahoo! invited 500 people to join their Y! Mail Beta test. I was one of the participant. Here's a screenshot of the new upcoming Yahoo! Mail. Already arguably the most popular email client in the world, the new Y! Mail is moving the richness of desktop application to the web Ajaxified.
Everything you would expect from email app like Outlook: Drag-and-drop, reading pane, and so on are built into this new mail. Click on the thumbnails to see the larger version.

Hotmail is also not far behind with their Beta release.



More screenshots: