Google Webmaster Tools has an option that allows you to supply google a specifically formated xml file of the sitemap of your site. Savvy generates this document for you.
The document can be found in the root of your site and is called googlesitemap.cfm.
You may move this document, delete it or rename it as appropriate.
To submit to google you must do it in this format.
the ?ext=xml is the important part. It tells google it really is an xml file. Without it google may not parse it correctly.
You must have a google account made and sign up for the webmaster tools program at:
This tool does not apply date times to each URL nor does it assign priority. Should you need that you may consider modifying this script or buiding your own xml file.