[Usability] Use circles in password field

[William Jon McCann <mccann jhu edu>]

Hi,

What do you think about using a black circle as the "invisible" 
character in password fields instead of an asterisk [1]?  OS X and XP 
both do this.

Besides that I think it has some advantages.

  * It is cleaner (no edges)
  * It is easier to see (for a11y and on LCD screens in sunlight)
  * It isn't a character that is commonplace on most keyboards

I'd like to make this change for gnome-screensaver but I'd like your 
opinion before asking the release-team for approval.

Does the HIG address this?

Thanks,
Jon

[1] http://bugzilla.gnome.org/show_bug.cgi?id=332053