Hi Chris,
It's been a while since the last comment. I hope you can still see this one. I'm just wondering about the mapping for the "context menu" key (you know, the key that does right click under Windows). Does it have the same functionality under OSX? Can it be mapped to do "Command"? I'm a touch typer. When I type Command + Tab for example, I use my right hand for "Command" and left hand for "Tab". But the 4000 doesn't have a "Windows" key on the right hand side!
Review: Microsoft Natural Ergonomic Keyboard 4000