I wouldn't say I have had 100% success but when I wanted to get some AI vector files into DN I had to import them first into CorelDraw, tweak them a little (particularly if you have text or gradients) then save them CDR files. Sadly it wasn't a simple export from Illustrator to DN.
I was able to upload an EPS file saved from Illustrator in CS2. However the text isn't editable and I try to change the ink colors and the swatches show they have changed but they don't change in the actual design. Is there anyway to make an editable template without Corel Draw? If not, I was hoping I could upload the graphics and create templates from those graphics by adding the text inside the online designer then saving that as a template for people to work from. But I don't see that I can do that either. Please help!