These kinds of interfaces are more for desktop/end users and you pay a surcharge, I think you would be better off using S3 or something similar directly. It's

These kinds of interfaces are more for desktop/end users and you pay a surcharge, I think you would be better off using S3 or something similar directly. It's cheaper, there are better tools to interact with it programmatically, and it is "pay per actual use" instead of a flat fee. You can also usually "flip on" the CDN feature for very popular and/or large files (Rackspace's CDN feature is performing better than Amazon's CloudFront for people currently). Beware the bandwidth charges though. For some situations you would be FAR better off renting a VPS or even a dedicated box, it all depends on the particular deal and your needs.