I would like to be able to have my web part listen for when an item is added to a spatially enabled list, then do something with the coordinates of the list. Any suggestions?
Figured it out (sort of). Build a Silverlight Application as explained here. Add a class with commands and/or behaviors for your Map web part. You can create an object from MainPage and use any members of it in this class, as far as I can tell.
This will get you Context.Web which allows you get get list objects by name. I haven't figured out how to wire up an item-added event handler, but I have used this method to add list items programmatically through the web part. (Don't forget to upload your extension to the Map web part and add any commands/behaviors!)
Okay, so I guess you can't wire the event handler in the Silverlight application, as you need to use Microsoft.Sharepoint libraries which you cannot do in a Silverlight application. Oh, well...
