A new update of AOL Webmail Beta with all the Ajax based goodiness has been released for public testing.

Here are the main features of this Beta:

New look and feel that provides you with more room to read and view messages.
One-click to your new messages: The Today page has transformed into the Today “curtain,” which you can quickly show or hide. You can choose to view the latest headlines or go immediately to a new message.
In-line read and compose: No more popping out each and every message in a new window - unless you want to, of course! You can individually pop-out a message or change your preference in Settings to pop-out messages every time.
Scrolling list view: No more paging through all of your messages! With Cayman, all of your messages will appear in one scrolling list.
New and improved panels: We have included a People Panel with hover controls and short-cuts to email, IM, or edit the contact; a To Do’s Panel; and a panel with TMZ.com feeds. Look for more panels in the near future!
Add/Edit folders more quickly: You can now add a new folder from within the folder list view and edit/delete folders more easily.
Improved contacts: With Cayman, we have included buddy icons and AIM-like hover controls when you roll-over a contact name. You can initiate an IM or email in just one click!

The interface is similiar to Yahoo! Mail Beta. Initially, the interface takes a lot of time to load but works faster and smoothly later on.

Visit beta.webmail.aol.com to sign up now