Cufon text does not show up in a submenu (visibility: hidden)?
Fix: Use display:none / display:block instead of visibility
IE Opacity Ignores Positioned Children
If you set a child at position relative or absolute, the child will ignore the parent opacity.
Fix: Stick to position: static and try to position via margin-left, margin-top
IE7 defaults to overflow: hidden
Not really a bug, but considering all the other browsers have overflow: visible as the default value, it can be confusing.