WordPress 2.9: Move to Trash feature:
Our Gmail users must be aware of the trash feature in the web application. We move a mail into trash, and it will be deleted automatically after some time frame. You can restore it within that time frame.
The same feature for posts, pages and comments is going to be introduced in wordpress 2.9. We can move an article or comment into trash and it will be deleted in 30 days ( default value).
Check this screen capture: (Screen capture belongs to WPEngineers)