Microsoft quietly added the capability for font anti-aliasing (font smoothing) in Windows XP Service Pack 3. This applies to Terminal Services (Remote Desktop / Remote Assistance) connections. This is very easy to do. Just open up regedit (Start->cmd -> regedit) and make the following change:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations]
New DWORD Key: AllowFontAntiAlias
Value: 00000001
That’s it 
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one more thing: you will need to restart terminal services (or alternatively the box) for it to take effect