This is really a non-issue. Mac OS 10.4 puts leftover temporary files in the trash upon startup, from time to time, even on systems where SuperDuper is not installed. It's normal behavior for the OS. See for instance,
http://docs.info.apple.com/article.html?artnum=301913
and
http://www.macfixitforums.com/php/sh...7&o=31&fpart=1
Apple's recommendation (see above Knowledge Base article) is "Don't worry," these files can be "safely deleted."
People with a lot of time on their hands can write scripts and the like for this. For me, the File => Empty Trash command seems about as easy as it gets. If this is what folks have to post about in this forum, well then I'd say that reflects pretty highly on Tiger's and SuperDuper's reliability that this is all that's left to complain about.