Check to see if the Fooman extension adds a layout file. More than likely, it is adding a second block that is also generating the analytics you reference. Once you find it, you can reconcile the blocks.
Assuming you are using some kind of custom package, you could copy
/app/design/frontend/base/default/layout to your
/app/design/frontend/theme/default/layout folder and simply clear out the references to the
googleanalytics/ga block. The Fooman extension should still output this block and this should take care of your duplication.
<!-- REMOVE THIS -->
<block type="googleanalytics/ga" name="google_analytics" as="google_analytics" template="googleanalytics/ga.phtml" />
<!-- TO HERE -->
Better, you can copy and modify the fooman layout file to your theme and unset references to the default analytics block by doing something like this:
I believe both of these methods are kosher; I like the second one better because in the event that you remove the fooman extension, your analytics will automatically be restored without any further effort on your part.