This post had a good tip about using SpaceBlock to browse your Amazon S3 account. I have been using JungleDisk to back up several of my computers to Amazon S3 for several years now. When I browsed my storage, I realized that I had backups in my S3 bucket for computers that I migrated all of my data off of. Since Amazon charges a monthly charge for the amount of data that you have stored, I decided to clean up my storage.
I ended up not using SpackBlock to delete these files. I just used JungleDisk to delete these files. I was able to use either the web based browser that JungleDisk provides as well as actually mounting the storage, an just deleting the files.
It tool several hours to delete the files, but I hoping that I will save a few dollars a month.