I hope this is the right section to post on, but I guess this is very good to use for offline clients.
We (DH) have released today this plugin for free:
WordPress › DH Local SEO « WordPress Plugins
If you know Yoast's Local SEO plugin, than you already know what it does. Thought his one is paid.
It's add schema-markup to your or your client's physical address & generates a .kml-sitemap aswell.
Let me know if you have any problems setting-it up, or if you have any other suggestions to implement.
If enough people are interested, we will see to make a standalone version aswell.