No, I've set a cookie with a .freerepublic.com (double-dot) domain, and it didn't register for some browsers. So I set it with a freerepublic.com (single-dot) domain, and it didn't register for others! Still, for others, it didn't register if the user had came to
http://www.FreeRepublic.com (mixed case.)
@(
*@&@&^!!!!!
I'm not setting the domain, just using the default. And that seems to work. I think.