NOAA's WFS - Instant Access to Climate Data
NOAA's National Climatic Data Center (NCDC) is "the world's largest active archive of weather data" - producing numerous climate publications and responding to data requests from all over the world. As part of its access programs the NCDC provides its geospatial data through OGC web services (WMS, WFS, KML/KMZ) and Catalog Service for the Web (CS-W). We tried the WFS recently in Gaia (above) and they work great. The data is overlayed on USGS Framework WMS, NASA OnEarth WMS and OpenStreetMap. Looks like lots of potential for open access to climate data.