hi PutterH,
the easiest way to find cards that you've uploaded to the gallery is to search by your user name. go to the main page of the gallery and put 'putterh' in the search box. make sure the 'username' option is selected then click the search button.
we'd prefer not to have multiple copies of a card in the gallery, so don't upload them twice

your request is one of the ones we hear fairly frequently though, so perhaps in the future we'll have a way to classify a card in multiple ways.
any more questions please let us know...