As it turns out, there were several things wrong with my work that I 
stumbled through between when I posted my question last night and this 
morning.
1) Yes, as you suggested I removed the () from the function being called by 
setOnLoadCallback
2) There were some errors with my JSON response:
    a) I hadn't added reqId as one of the parameters in my response.  This 
is kind of ridiculous since when you're using query.send(callback), it 
overrides any tqx parameter provided with tqx=reqId:0.  I feel that's a 
little buggy
    b) there were some errors with the format of my output around rows and 
their cells
3) Rather than trying to make my own data table from scratch, I ended up 
following 
http://code.google.com/apis/ajax/playground/?type=visualization#data_source_request
 and 
making small changes until I had my data, etc, working as expected.

Thanks for the help!
William

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