Nirvanix offers "Image manipulation such as image resizing, thumbnail generation, and rotating, video frame extraction, video conversion to Flash video". Is there any competitor? I guess building one on top of S3/EC2/SQS from Amazon would be a no brainer.
I am not clear here. My problem is that likely one single server will not be enough at some time. Same can be said for any number servers. But I do not want them to sit around just to answer in the rare case of video upload bursts.