Funny thing though, I can't see any REV.C for the DIR-825 on the D-Link site.
Only REV A and B are listed.
I have a DIR-825, Rev B1, with firmware 2.07NA.
The Shareport utility works fine from my PC under Windows 7, accessing pictures and other document on my USB key connected on the router, so I really don't see what could prevent my iPad from accessing the same resources.
Another mystery that need to be clarified !