You might want to not install the 'Desktop Experience' feature on Longhorn terminal servers and/or disable Aero for clients, because each terminal services session spawns a new instance of DWM on the server.
The client does most of the heavy lifting drawing Aero, but I could forsee DWM becoming the ctfmon.exe of Windows Longhorn Server if you enable Aero for TS sessions.
Of course, with 64-bit terminal servers and gobs of ram, it isn't going to matter too much overall. I am thinking more along the lines of future SBS servers.
This tip originated from Eric Holk at MS on the LH TS newsgroups, btw, to give credit where credit is due.
