@ Clips, we are working each day with designs from customers but if they start uploading jpg's with black background and you need to put it on a white tshirt then its easier if we have a .eps we can then easly enlarge it because all our full color prints are around 30cm width, so we get allot of customer who upload us a 300px design this aint going to work. it will look great on designer but we cant work with it.
There are some designertools that let the admin pick what output he wants including .eps.
Makes sense. It would be cool if you could choose what form of output we wanted in the admin. I'm just not for sure how easy that is.