I am a big fan of authentic assessment. Moving away from multiple choice and fill in the blank towards actual creation seems like a great use of time. Mapping is a very authentic way to grade everything from novel reading to math and Social Studies, and it is also a perfect way to chart knowledge as you learn new content. Scribblemaps and Tripline and Google Maps do this very well. That said, it never hurts to have one more trick up your sleeve.  With that in mind, I toss GmapGIS into the mix. It is not as flashy as Tripline or as intuitive as Scribblemaps, or as Google-ly as Google Maps. It is, however, the right thing for the right time.

Use it well.