Cases that work with iTrip, iTalk?

[tayhall7]

I have the contour designs 4G case and Speck Products 4G case but neither of these work with my iTrip or iTalk.... Please Help!

[Elixir]

Agent18 case works for sure..and I believe the iSkin is compatible with the itrip/italk also but someone would have to check me on that...