RemoteDesktop v1.5 for Mango has finally been upgraded to a true stand-alone client, without the need for an intermediate proxy server.
Remote Desktop will securely connect to any Windows XP, Vista, 7, 2003 Server or other Windows computer running at least Professional without any extra configuration except for enabling Remote Desktop Connections.
The app supports standard security, or Network Level Authentication and supports screen resolutions from native Windows Phone 7 resolution up to 1600 x 1200 and in 256 colour or 64 thousand colours and also offers support for advanced RDP draw orders for high performance on low bandwidth connections.
The app supports Pinch to Zoom and comes with its own soft keyboard with Alt, Ctrl and other keys missing from standard keyboard.
The app is $5.99 with a free trial and can be found in Marketplace here.