The home and sub page templates work just fine in:
Opera ("accessibility" mode also works right)
So of course the only problem child is IE. The sub page template looks all right in IE6-8, though. That's good. (actually the search box is slightly too tall in IE6, but no one will notice unless they already know to look)
So that's 6 major browsers tested. I'd say that's enough.
The home page template looks all right in IE8, but that is only a beta for now.