I have an Apple dock made for the first gen iPad.
This one... Apple iPad Dock - Apple Store (U.S.)
I use it for my iPad2 and it seems to work fine... charges/syncs, and it holds securely. (Charges only when plugged into wall... not USB to PC)
I can also use it for my iPhone4... charges/syncs, and holds "fairly" securely... there's just enough room.
Do I have anything to worry about by using this dock for both devices? Any concern of overcharging or damaging either device?
My intention is to own two iPad docks that I can put in two different rooms and use for both devices. Because of the shape of the iPhone4 dock, it can not be used for an iPad2.