Anyone have examples of a well-known, successful company which is fully virtual like this?
I'd say that Automattic, the company that this poster works for, is pretty well-known and successful (makers of Wordpress, Gravatar, etc.).
Also, DuckDuckGo (where I'm an intern) is mostly distributed, though you might have to stretch your definition of well-known to include us. :)
[1] See around 1:30 in this video (I can't remember where I actually read about this): http://careers.mozilla.org/en-US/ [2] http://zachholman.com/posts/how-github-works-hours/ , http://zachholman.com/posts/how-github-works/