If you install edrawing for proengineer on to your proengineer WS you can export into edrw and easm file types which can be viewed on Ipad with edrawings for Ipad. Works fine for me. And bonus of that is that you can view all the files offline one you download your files. I use dropbox for that.
If you have more questions. Please ask Iwill be glad to help!
I think I read something recently about an iPad version of Creo View coming soon.
I would take the eDrawings solution though. The files are much smaller and much easier to manage.
To view a model export to the "edrawing" format and then install the edrawings viewer for ipad from here: http://itunes.apple.com/us/app/edrawings/id520231936?mt=8
This may not be the most efficient but it works for now
Creo View Mobile is available here:
Creo View Mobile Quick Tour: