Is it possible to setup Amazon's Simple Storage Solution to use custom domains (storage-01.example.com, storage-02.example.com, storage-03.example.com, ...) without using Cloud Front? I don't really care about having an 'edge' network, but do want the browsers to make parallel requests for assets. Thanks!
No, unless you duplicate your keys into multiple S3 buckets. This is because S3 uses the Host header value as a reference to the bucket.
I guess you could be sneaky and take advantage of the different URL styles. But it's a horrible suggestion and I would never implement it.