MOSS 2007, Infopath 2007, browser enabled forms. No Exchange server,
so hands are tied in some regard. My preference for solutions would be
no-code involved, but I not a code-hater, I just don't know C# or VB
and I'm trying to get this seemingly simple pilot-project off the
ground.

I've got a form library and an Infopath form that submits to that form
library.  No problem.

I'm looking to user-proof this form library so my users can't
inadvertenly create duplicate entries when they really intend to edit
an existing entry.  What makes sense to me is to *somehow* determine
if the form the user just loaded in their browser is creating a new
entry, or editing an existing entry.  I thought I'd be able to bring
in the "Name" or "ID" field, but I can't get that to work.  I've
created a Data Connection pointing to the Form Library where the
Infopath Form is submitting to, but it fails to get the data I'm
looking for.

I need to use "Submit" because there is a bunch of validation to be
done. I've disabled the Save As... and similar features in "Tools ->
Form Options -> Browser"

Any help will be greatly appreciated. Greatly.

-James