* [Support Center/Branding/Usability] A simple 'Logo URL' setting can now be configured for Support Center portals.  Previously, logos could be changed by editing the header.tpl custom template, which was more flexible but also more complicated.  That template may still be modified for more complex customizations like mimicking the look and feel of an existing site.
* [Support Center/Branding/Performance] A 'Favicon URL' setting can now be configured for Support Center profiles to display an icon next to the URL (and in bookmarks).  Previously, this had to be configured by modifying the index.tpl custom template, which could cause unnecessary conflicts during an upgrade.  This also improves performance because browsers perform an extra HTTP request looking for a favicon when one isn't specified, and the Support Center was going through the work of rendering the home page again in response to these requests.
* [Support Center/Performance] The Support Center now caches visitor session lookups globally for the duration of the request.  Previously, features could load the session from the database multiple times.
6.7-dev checkpoint