extensionIcon

for gmail

Use Gmail as any email application, with drag and drop attachments and more! Bubbles for Gmail turns your Gmail inbox into a powerful application. Just like Outlook, Bubbles for Gmail lets you access quickly and minimize to tray, get notifications for new incoming mail, drag and drop attachments directly from your desktop files, and much more.

expander Gmail notification pop-up
smnh says:

The GMail script tries to make a good job of keeping you posted on new emails coming in.

Version features:

  1. Parses email headers (from/subject/first text lines/date) and notifies about new/unread emails.
  2. The look of the notification slightly reminds google talk notifications.
  3. Pagination between number of received emails
  4. Drag and Drop your files into bubbles to create new drafts with attached files.

If you wish to use Bubbles for Gmail with Google Apps, all you have to do is to download this script and to change the second line in the script from:
// @url https://mail.google.com/mail/
to something like this
// @url https://www.google.com/a/your-domain.com
Be sure to replace “your-domain.com” with your real domain name.