An article from Reuters reports is beginning to test a new version of Yahoo Mail. According to the story, the new version of Yahoo will Mail will make several new features available.
According to the article, new features will include:
- Drag-and-drop message organization
- A preview pane to view e-mails instantly
- The ability to search e-mail headers, body and attachments*
- As well as viewing multiple e-mails in different windows
About a year ago, Yahoo acquired Oddpost, to help bolster Yahoo Mail services.
*Yahoo has offered an e-mail search option for quite some time and has even enhanced the service in the past few months. Yahoo mentions mail search here but doesn't include info about it in their help documentation.
Postscript: A ZDNet article has a bit more info.