When I saw the Atrix (AT&T) I liked the dock concept, enabling big keyboard screen support. However they won't let you use the dock without paying for tethering on AT$T. Which seems like a rip off since you are not sharing data with an external device only controlling your local one with a more accessible input device and screen.
I wonder if Sprint will allow the dock on the standard plan (naturally with our carrier exclusive "premium data" charge)?
I've seen nothing to indicate its going to cost extra to use the feature and furthermore doing so would go against Sprint's overall billing concepts. They're not going to try to nickel and dime you to death like ATT does.