Where are user crons?

[Robert Moskowitz <rgm htt-consult com>]

I am switching computers and quite some time ago set up a crontab to 
delete old thumbs.  I moved the shell script, but can't remember (and 
did not document) how I set up the cron job.

Can't seem to find it in the gnome apps, nor can I find a .whatever file 
that looks like a crontab.

Please help, I want to format this old system already  :)