Q:

Is it possible to sort files on Amazon S3?

Also, is it possible to set a default sort order for a bucket on Amazon S3?

A:

For viewing, or for some additional processing?
If you want to sort the files for viewing on a Windows desktop, an inexpensive option is to install WebDrive and map a drive to Amazon S3.  You can do a column sort by date, file type, name, etc.  

