You can now undo archives, deletions, additions or removals of a label, or movement of a message or conversation for a few seconds after performing that action in the Gmail mobile web app.
Editions included:
Google Apps, Google Apps for Business, Government and Education
Languages included:
All languages supported by Gmail for mobile
How to access what's new:
Visit your Google Apps mail account from your Android, iOS, or Blackberry OS 6.0 phone and click on the undo option after performing one of the supported actions.
For more information:
http://gmailblog.blogspot.com/2011/04/undo-certain-gmail-actions-in-your.html
whatsnew.googleapps.com
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