Have you seen JungleDisk ? It setups a webdav server on your local machine so you can drag and drop files for backup. I'm kicking the tyres on S3 to see if I can make it work with subversion.
the webdav port is http://localhost:2667 - I'm not sure if subversion works with webdav but if it does then I'm sorted.
Thanks for the comments. The screenshot shown is from one of the new sample themes that ship with the product. I probably won't use that on the website but it will be available for use by customers. I may provide a link to the sample themes from the main pxn8.com landing page.