Here's how to extract data out of a Google Doc spreadsheet.

Here's our victim...

http://spreadsheets.google.com/ccc?key=pUetVbUnXgLbDjatWZKjVAw

Note - If you are interested, you can sign up here: http://tr.im/gHHS

Now go to the Google OAuth Playground.

http://www.googlecodesamples.com/oauth_playground/

Select spreadsheets for the scope, then click on all the buttons.

Then enter this query.

http://spreadsheets.google.com/feeds/cells/pUetVbUnXgLbDjatWZKjVAw/1/private/full/R7C3

You should get an XML file back with "Darren Barefoot" in the "content" element as the result.