Google LatLong Blog posted that Google Maps added a new community layer for the My Maps feature: comments and ratings. You can now create personalized maps, transform them into wikis, import content from KML files and search results, add photos and videos, embed the map into your site. Even though these community maps are included in search results. Ratings and statistics will help Google create charts and show things like "popular community maps in your area" or maybe connect your search profile with some maps.
From Google LatLong Blog:
Google, Maps, Google Maps, New Features, Community
….we've launched a special page for every user-created map where you can leave comments and star ratings. You'll also find a top links section that shows which websites and blogs are referring traffic to the map. If you're curious about where your map's huge number of views have been coming from, just check out your referrals.
To get to the new comments page, just click on the new ratings and comments links on the My Maps pages….