One of the little know facts about the latest terminal service client 6.0 is that you can do monitor spanning.  This allows you to stretch your server desktop across multiple monitors.  This can come in very handy when you are trouble shooting a server problem and would like to have several windows open at the same time.  There are a couple of things that you have to take into consideration.  The first is that both monitors must be set to the same resolution and also must be set under 4096 x 2048 pixels.  The second thing is that the monitors have to be aligned side-by-side.

Microsoft KB Article - RDP 6.0
http://support.microsoft.com/kb/925876