I wrote this Web page designed for phone / PDA access that allows you to discover the 3 nearest Geocaches for a given position. Returns rough bearing and range, precise lat/lon, description, and clue (ROT13 obfuscated by default).
The technology preview of WSE 2.0 provides early access to new advanced Web services capabilities. New features include a policy framework, enhanced security model, message-oriented programming model, and support for multiple hosting environments. [Microsoft Download Center]