Actually, logged in users are much more expensive to serve than logged out.
So it depends what percentage of users we are talking about.
In any case, a cache-busting cookie is just as costly as being logged in
(since being logged in also involves a cache busting cookie).
On Saturday, October 1,
How about a one-click 'account creation + customization' option, which
updates the skin, rerenders the page, and asks the reader to finish setting
username + password to save the pref?
That seems cache cheap and a fine tradeoff: more readers with accounts
would be good on a lot of levels
Basically, if you are ok with it only taking affect after page load (so
users see first the original page then the new version) it is trivial.
However flash of wrongly styled content is a really bad user experience.
To do it without the flash of wrong version of toggle, is difficult due to
the
