I have seen/developed 4-5 flash based designer studio. These designer studio are more or like the same, where we have product and then user can upload his text or image and get it done. But over the time I have seen some new enhancements has made their road to improve working and interface of application. Some of these features are:
1. Cropping of User Image on upload
2. Image editing option such as red eye correction, resizing, some different filters etc.
3. Text decoration and Arc Placements
4. Masking of Image in manner that any irregular shape is shown visible/3D view of product with user image.
However these feature list are addition to basic software, but in last few prospect I observe they are becoming more or less the part of default studio. Now this is what we call Moving computer to WEB. User want to do everything on web only.