Primary links don't render correctly in IE8 or FF3

Hello,

I've attached a screen shot of what happens to the Primary link menus in FF3 (and I'm told IE8 but I haven't seen it with my own eyes). I've also included a screen shot of how it should look too. I've fixed this issue on my site by adding a display:inline-block; to '#menu ul'. Just thought I should point this out. Great theme by the way. Lovin' the work.

#menu ul {
margin: 0;
padding: 0;
list-style: none;
line-height: normal;
display:inline-block;
}