Another improvement done lately is availability of site/page views where relevant:
When creating a new site you see a preview of the selected colors and where they apply, so you get a quick feel for how the site will look even before it’s created.
On Sites, Edit Site, Pages and Edit Page there’s a View button beside the Save button, so you can immediately see how the settings you made affects the rendered content. You can then go back to where you were with Close and continue editing if needed.
The page view is actually the site view at a certain page, so when looking at a page view you can navigate away from that page to see its context. You can also open a new tab/window to see the rendered site without any framing.