ASP.NET

void Application_Start(object sender, EventArgs e) 
{
    //
    // Register a handler for SiteMap.SiteMapResolve events to hide the
    // root node from SiteMapPath controls.
    //
    SiteMap.SiteMapResolve += new SiteMapResolveEventHandler(HideRootNode);
}

static SiteMapNode HideRootNode(Object sender, SiteMapResolveEventArgs e)
{
    //
    // Hide the root node from SiteMapPath controls by cloning the site
    // map from the current node up to the node below the root node and
    // setting that node's ParentNode property to null.
    //
    SiteMapNode node = SiteMap.CurrentNode.Clone();
    SiteMapNode current = node;
    SiteMapNode root = SiteMap.RootNode;

    if (current != root) // Just in case the current node *is* the root node!
    {
        while (node.ParentNode != root)
        {
            node.ParentNode = node.ParentNode.Clone();
            node = node.ParentNode;
        }
        node.ParentNode = null;
    }
    return current;
}

.PageHeading > a:first-child + span + span<br />
{<br />
	display: none;<br />
}