You've seen this - on an ajax-heavy page, like meebo.com, the browser never stops 'spinning', it never indicates that it's finished loading. What causes this, and is there any way to consistently tell the browser (whatever browser it may be), that loading has completed?
EDIT: Sorry, I should've specified that I'm a developer here. I've noticed this on other sites, and now one of mine as well that's using ajax. I want to make sure that when an ajax call comes back, the page stops 'loading'.
I answered this question in another question:
Stop the browser "throbber of doom" while loading comet/server push iframe
There are browser-specific techniques to make the spinning stop, or not to begin spinning at all and still load data with a server-push.