Needless to say, this is useful when you’re using a “weblog as gallery”.
Unfortunately, right now this only works on a field whose Field Type is “File” – which is another 3rd-party extension, by Mark Huot. You can get File by Mark Huot here.
You enter one field id (the field id for the File field you have) – and Weegee will put a thumb from that field on the Edit page (see attached pic). This also only works with one weblog right now. Updates will happen if anyone has suggestions - or anyone cracks this open and sees cool ways to update it. Suggestions welcome.
You can download Weegee here.
