I absolutely agree with Anil. He complains that mobile devices (such as my little iPaq running the .NET Compact Framework) do currently have no (official) support for all the WS-* stuff. Or better said: Please Microsoft, give us a WSE implementation for the CF! There is a partial implementation of DIME and WS-Security for the CF by Casey Chesnut, but hey: although this guy is really bright and hard working, we need this as an integral part from the manufacturer itself.
But I have the dim feeling that such a support is not under the top five issues to be currently looked at in Redmond :-(