Site Mode: Guest View
Site Modes are currently, "Live Site", "Edit Widgets", "Manage Styles". Since I can restrict some items/widgets to members/non-members, I have a need to see how my site looks to non-members.
This is currently only doable by logging out to view the page as a guest would, then logging back in if I want to make changes.
Solution:
+ Site Mode; Guest View
While in Guest View the user will only see items/widgets that would be visible to non-members of their site.

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Anonymous commented
I am in agreement that this would be a useful tool. I know that I can use a different browser, but I am finding this to be unnecessarily cumbersome.
Thanks for considering this. -
You can currently do what you're describing with another browser as well. I'll keep the suggestion open to see what sort of traction it gets, though. :)