I think the reason "MacBook Pro" sounds so strange to everyone is because it has come out before the iBook replacement which most likely will simply be called "MacBook." If you look at it in the context of the MacBook and the MacBook Pro it seems to make more sense. The Pro part of the name is in line with other Apple products like Final Cut Pro and DVD Studio Pro. Let's just hope that the iBook replacement isn't actually going to be "MacBook Express" and the PowerMac replacement isn't "iMac Pro."
MacBook... what else could it have been?