The most important new feature is the ability to force a domain to render with "www" or without. Previously, sites were visible both ways which in SEO is duplicate content.
First runner up: when you submit a form in the Database Manager or in Content Setup, you'll get a simple notification that the form has been submitted.
DHTML drop-down menus saw the most important bug fix. You can now reliably select the drop downs on Image and Image-rollover Content types.
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