ESRI has a REST API, GeoServer is going to have one, now MapGuide might get its own RESTful service. The City of Nanaimo smartly realized that using a RESTful service was a much better way to get data to the public than a traditional WxS or ArcIMS service (take note of that NSDI 2.0 folks). Jason Birch has all the details including the URLs to explore the service. I like how Google has already crawled their service and it is discoverable via Google Search. Hopefully Jason gets some great feedback and this Nanaimo project can make it into the MapGuide trunk. Their work is impressive and the results speak for themselves.
Getting RESTful in Nanaimo, BC