A few themes have a sitemap as a built-in Page template, but do not think that iTheme2 is one of them. If you want a separate sitemap page you would have to build it and update the links manually.
If you are referring to sitemaps as far as Google Webmaster tools go, every site has an XML sitemap. See here:
For explanations of both, see here: http://en.support.wordpress.com/sitemaps/
However, before you get too far along you might want to check with Staff to make sure your site is in compliance with the Terms of Service.