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"The Global Social Factory and Supply Chains" blog
Live Tracker Websites
Here's a short list of live tracker, and related, websites I've come across.
#1: This website provides real time locations of all vessels within range of a receiver. So basically only vessels in port, or inland waterways, or close to shore, etc. Nifty for explaining what one sees in the San Francisci Bay.
#2: This website is a registry of all vessels. Searchable by vessel, company, etc.
#3 This website has a well documented g-map of ports, both coastal and inland.
And of course, please add any other resources you find!