You can use the following code snippet to iterate through your navigation tree recursive:
using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing.Navigation;
public class SiteMapTest : System.Web.UI.WebControls.WebParts.WebPart
{
protected override void RenderContents(System.Web.UI.HtmlTextWriter writer)
{
PortalSiteMapProvider map = new PortalSiteMapProvider();
writer.Write("<table>");
this.PrintTree(map.RootNode, writer, 0);
writer.Write("</table>");
}
public void PrintTree(SiteMapNode node, System.Web.UI.HtmlTextWriter writer, int level)
{
string space = string.Empty;
for (int i = 0; i < level; i++)
{
space += "  "  ";
}
writer.Write("<tr><td>" + space + "<a href=\"" + node.Url + "\">" + node.Title + "</a></tr></td>");
foreach (SiteMapNode childNode in node.ChildNodes)
{
PrintTree(childNode, writer, level + 1);
}
}
}
If you use a SPSiteMapProvider instead of PortalSiteMapProvider, you will only see your sites, no pages.
SPContentMapProvider delivers nothing for me, there are no ChildNodes defined. I didn't check out SPNavigationProvider, but I had some bad expierence with Microsoft.SharePoint.Navigation.SPNavigation.
For some more informations see: http://msdn2.microsoft.com/en-us/library/aa830815.aspx#Office2007SSBrandingWCMPart2_CustomizingNavigation
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