If you specify StaticMenuItemStyle-ItemSpacing on a menu the items will get double the amount of spacing, ad the last item will get this 'spacing' applied to its right side. For example, if you specify a spacing of 3 pixels, you'd expect this:

||Item|   |Item|   |Item||

But what you get is this: 

||Item|      |Item|      |Item|   |

Notice how we get an effective spacing of 6 pixels and how the last item has a 3 pixel margin.

Is this a bug or what?
 

You may be interested in the ASP.NET 2.0 CSS Friendly Control Adapters. These Adapters override some of the standard ASP.NET controls (like the menu), with a more CSS friendly version. The CSS Friendly Menu is much easier to manipulate - here's an example of the menu.