These days 1366x768 is quite common, but when you use such a laptop to do Remote Desktop, it is quite hassle. If you use 1024x768, you cannot see the full height of the remote desktop, but there is no option for, say, 1024x600 or 1024x736.
This is the solution: open Command Prompt, type the following line:
mstsc /v:192.168.1.101 /w:1024 /h:736
Of course you may replace "192.168.1.101" with your IP or host name and you can change width and height to any numbers.
From now on, you can start RDP either this way or the normal way and the resolution will stay.
PS: another method is to edit the Default.rdp file found in your Documents folder.