We implemented Web SSO with ADFS. It works great, but the development experience was limited to W2K3. This was a problem as development workstations were XP. So we had 1 server on the side to test code against. We pulled down the dll to the XP development boxes which allowed for compilation, but testing only on the W2K3 server. A new framework for claims based identity is in beta from Microsoft. It is code named Zermatt. One of the interesting things from the developers perspective is that with Zermatt ......