This is cool, but doesn't explain that if you are using iWeb '06, the url should include /iWeb/ between username and sitename.
I needed to include all this before I could add the sitemap and the verification files correctly and direct Google wabmaster tools to it. I don't know if this is just me, or if it is for everyone using iWeb 06, or every .Mac user- but it would be good if this is mentioned on your site.
(Uness of course I am in the wrong place!!!)
NB iMap had the same problem, and missd the /iWeb/ step out of the URLs in the sitemap.