Currently when you upload a jpg that has html in the exif tag you get a message alla: "This file contains HTML or script code which could be executed by a browser".
This is really not that helpful to the "normal" user. It doesn't say what the user has to do to rectify this problem if he wants to upload the file. I was thinking that perhaps this is a location where we could add a link to a Mediawiki help page or something. This page could then detail how to remove html code from an exif tag or from some other fileformats and give further hints on how to deal with the problem.