Is there a way of viewing my Google+ check-ins as pointers on a Google Maps?
UPDATE: Now that Google Latitude has been retired, my answer is no longer relevant. How can I view my Google+ check-ins without Latitude?
You can still see your Google Location History at https://maps.google.com/locationhistory/ assuming you have location tracking enabled. (Does it show check-in locations? I don't use that feature. For those who miss Latitude, there's now Google+ location sharing.)
Also in the new Google Maps, "My custom maps" is in the menu below the search box (it was restored recently), and you can click the gear icon to get to the "My Places" menu command.
However the word is that there's no longer a way to view check-ins on a map.
[If you can export your check-ins as (latitude, longitude) coordinates, you can import them into Google Fusion Tables. Fusion Tables can readily plot locations on a map.]
Open Google Maps and click "My Places". That should show what you were looking for.