Drupal Association members fund grants that make connections all over the world.
I searched for this, but couldn't find it anywhere, so sorry if it has already been mentioned.
When adding a new file to a filefield using AJAX, when the new file information comes back with the mime-type, filesize, and the filename as a link to the file, the link should have a target='_blank' attribute, so that when users click on the link, they don't loose all the data they may have changed in the form.
I might look at creating a patch for this if there is no reason this is not added. Is it just a matter of adding the attribute in theme_filefield_file()?