Not only a great hit at how to use Google Map's API, but also just exposure to APIs in general. I've seen this topic come up a few things in the last month or so.
The tutorials will cover all sorts of things. To name a few: custom map colors, menus and markers; bringing your own map design (e.g. a handrawn map) to life by overlaying it onto a zoomable google map; linking up to the Flickr API; image optimization; responsive design; code optimization and validation. Or, in other words, by the time you’re done, not only will you be able to create lovely maps, you’ll also have looked at many things relevant to building any website.