Free Online Mapping Tool

I wrote back in January:

Anyone care to build a website where I can upload GPS track data and waypoints, annotate it, plot it on a topo or aerial map, and legally publish the result on my website?

Apparently somebody did it. Check out the GPS Visualizer. I just found it today, and I haven't played with all the available features, but so far it does exactly what I want. Sweet!

As a demo, here's a quick map of my Capers Island trip that I made. Click on it to see the larger version. The color variation indicates changes in speed, so you can see where we paddled fast with the outgoing tide near Bull's Island (northeast corner) and then paddled slowly against the same tide on the way back.