I'm wondering if anyone can recommend a 4-bay NAS with AFP/TimeMachine support and the ability for me to install s3cmd (a utility for simple S3 syncing).
The reason I ask is simple: just having a back up at home isn't good enough. I've used Dropbox for a while now but since we've got a number of machines my ultimate aim is to back them up to a NAS and for that NAS to sync with S3 a few times a day so we'd have a remote version.

s3cmdat might be fine to reopen. – bmike♦ Apr 21 at 11:50