Good article on WindowSecurity.com about securing RDP using SSL. Important for PCI Compliance & better security in general.

Note that if you already have an SSL certificate from GeoTrust, etc. you can just use that certificate instead of creating a new one.

To do so:

• Under Request TLS/SSL certificate:
• For step 10 you'd choose "Import" and pick your existing SSL cert & allow the storage location based on the cert.
• Skip steps 11-14
• Under Configure the Workstation
• Skip steps 1-4 about importing the certificate
• You can download the latest RDP Connection software (version 6) here.