The site map doesn't really work logically for this site - it's got dynamic sub-pages that are represented by PHP actions.
For example, post.php can be used in two different ways, viewforum.php is used in three, etc.
But if you're interested, we're nearly a bog standard XMB - go grab the latest sources from
http://www.xmbforum.com and that'll give you an excellent idea of how our site is laid out.
There's a couple of additional directories for our unique stuff (chatroom, banners, etc) but that's about it.
XMB is not a good example of a well written product. It's a security nightmare, the code is awful, supposedly usernames are not keys to functionality, but they are for u2u's but not logins, etc. You can certainly use XMB as a "how not to do..." example.
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Andrew