I have been using Google Maps and Wikimapia from quite long time! Till yesterday if it comes to plan a trip I was getting confused between Google Maps and Wikimapia as both have some features that are unique to them!
What I was missing most is millions of placemarks (places annotated on maps by users) which covers almost everything exist on planet Earth!
Following two screenshots are enough to highlight difference between information you can see with and without Wikimapia Layer Mapplet!
This is screenshot of a location before adding Wikimapia Data (click on image for fullscreen view)
This is same location but with added data (click on image for fullscreen view)
Look at screenshot on right hand side >>>
If you are on search tab switch to Maps tab first!
Now every Mapplet have one check box associated with as you can see in highlighted area!
Just checking the highlighted box will Enable this mapplet! Similarly if you get feeling that wikimapias huge data is cluttering your Google Maps you can uncheck the same highlighted checkbox to disable this feature!
What??? Want to develope your own? Developer Tools are here!