I have a Kensington dock that so far holds my phone with any case. My husband ordered Defender cases for us about 2 weeks ago so they should ship any time. Once we get them, I'll post if the phones still fit in the dock.
Depends on what you mean by fit. If I leave on the back section of the plastic case and fish out the iphone adapter, I can dock it into my logitech speaker/alarm clock dock.