Mark...I hate to encourage feature creep, but how bout a way to send a lat/long ie...

rtr.ca/latN3422930longW08004760

and have it return nearby waypoints like:

GCH2A3
GCB436
GCB7D0

This would enable one to go caching at a moments notice. One could query the nearby caches and then query each individual waypoint to get the info.