So you've used Google's cool My Maps feature and laid out your map.  What if you want to then export the data to KML or GeoRSS format for editing?  As of now, there's no easy one click way to do it.  But alas, it can be done and its really easy Open up your map.  Across the top right of your map you will see a few options; View in Google Earth, Print, Send, and Link to this page. 

1. Right click on View in Google Earth and choose Copy Shortcut (Internet Explorer) or Copy Link Location (Firefox).
2. Open a new browser window (or tab) and past the link in the address bar.  Do not press enter just yet.
3. In the address bar, you should see a section that says &output=nl.   Depending on the format you want the nl portion will need to be changed.  Change it to kml for KML exporting.  Change it to georss for GeoRSS exporting.
4. Press enter and save the file.  Note that if you change it to GeoRSS, some browsers will display the RSS in the browser window.  No worries here.  Just right click in the browser window and choose View Source (View Page Source) and save the text.

Happy exporting!