Amazon S3 for Software Delivery - amazon-s3

I hope someone can help me answer this dilimma I'm having.
I am getting ready to release my new software and its associated content files. Since the File size for the Full version is Huge, I cant use normal software delivery methods. The main download is 450MB and then add-on packs at around 250MB for each add-on product.
So I plan to use Amazon S3 Servers to Host and Deliver Software.
Does anyone have any real-life
situations on the pro's and cons of
this method for the way I want to
use the system?
Does Amazon S3 offer Resumable downloads?
Is there a open source tool that I can use and modify that I can give to my end users to use as a downloader tool, which I can program so that they can download only what they have ordered and also give Expirable download links?
Is there a commercial tool thats available for the above task?
I need some advise on how I would automate all this for each user. Once a customer finalizes an order, I am ok with manually processing som stuff for delivery, but automated is the best.
thanks everyone.
DC

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cheers