Google Maps can be easily be embeded in WordPress.com blogs, using instructions at: http://en.support.wordpress.com/google-maps/
There is also an unofficial plugin to implement the Google Maps shortcode available on WordPress.com sites. Useful for users who are migrating from WordPress.com to self hosted WordPress.org sites and want their maps to continue working.
Import your posts from WordPress.com without having to edit all your maps.
Continue adding maps to posts the way you used to do it.
Support for custom width and height settings.