Since we are on a Google Maps coverage roll today, how about we keep it going. Google Maps recently announced changes to their map data, which Mike somewhat called out. In short, for many locations in the US, Google is now their own provider of data for their maps.
About a year ago, Google switched their map data to Tele Atlas. Now, Google seems to be moving off them. For example, look at the copyright on the old Google Map versus the current one:
There are a few threads in the Google Maps Help forum where Googlers are replying to this question, as follows:
Please use the 'Report a Problem' link (see reference below) to tell Google about the problems in your area (or anywhere else in the US). We hope to be able to fix the reported problems within about a month.
Here is a video explaining the new process to report map issues:
Forum discussion at Google Maps Help.