> gmarkers[i].setMap(null);
> Obvious question, does this just work for v3, or v2 as well.

It would for anything that has a setMap method.  Nothing v2 has a
setMap method.

> How can I tell if I am using v2 or v3?

You look to see how you are asking for the API
http://code.google.com/apis/maps/documentation/javascript/tutorial.html#Loading_the_Maps_APIhttp://code.google.com/apis/maps/documentation/javascript/v2/introduction.html#Loading_the_Maps_API
or you use a debugger to see what is delivered to your browser

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