Remote Desktop Console "/console" connection switch has been disabled in Vista SP1 and Windows 2008.
It has been replaced by "/admin". This is a huge problem for server administration if you didnt know about it!
It looks like it will be implimented in XP sp3 as well.
The following article shows more detail Ask the Performance Team : MSTSC.EXE - no more /console switch in RDC 6.1