After running a couple of thumb preview TGPs I noticed a LOT of the real quality submissions didn't include a thumb preview. Do most webmasters not know how to crop an image or do they just not want to take the time to do it? Either way, I thought having a utility as part of the submission process that would allow the submitter to create a thumbnail relatively quickly might be a good idea.
If you have some time, try submitting a gallery and making a thumbnail in the process. Is this something that submitters would actually use? Give it a shot and let me know what you thing and if there is anything that it lacks (or if something doesn't work).
Here's the submit form.
http://www.madtgp.com/submit.shtml
Keep in mind this isn't quite ready for release yet and might act a little goofy from time to time. I am not really expecting to be able to post many/any of the galleries from this little test so feel free to have fun.