In Vista SP1, XP SP3, and Windows Server 2008, the Remote Desktop Program has been updated to version 6.1 (6.0.6001) and one of the changes is that the functionality previously associated with the /console switch is now called the /admin switch. 

If you use "mstsc /v:servername /console" in a script file then the /console will be ignored (with no warning) and you will be connected to a normal session that is not the server console.  If you specify the /console switch in the RDC GUI connection dialog then it will tell you "an unknown parameter was specified in the computer name field".