Have you tried http://www.jungledisk.com/ ? It maps S3 to appear as a drive or directory on your computer, so you can use S3 from any program or tool that can read and write files.
Or is there something specific about WebDav that you needed?
Or is there something specific about WebDav that you needed?
2. I want the links resulting from upload to be directly and (sometimes) publicly downloadable without going through jungledisk. E.g. I use screenshot app called Skitch which saves screenshots to WebDav among other things. I want to be able to save screenshot and share it immediately.