It would be nice if FogBugz could get rid of the antiquated form field upload for case attachments and use a Flash file uploader to provide a progress bar. It's also possible to completely get around the max HTTP request size using Flash.
Of course if Flash is not installed or is blocked, it should degrade gracefully to the old uploader.
Just like gmail attachments. http://news.cnet.com/8301-17939_109-10172894-2.html
This also has the advantage that the files can begin uploading before the case is submitted, while the user is still typing out the case (if they choose to attach the files first). This can save a lot of time.