[joeyh]

Another good reason for certain use cases is its support for resumable uploads:

http://code.google.com/apis/storage/docs/developer-guide.htm...

Afaik S3 can't do that.

[spicyj]

No, S3 (essentially) can as well:

http://aws.typepad.com/aws/2010/11/amazon-s3-multipart-uploa...

[snewman]

Multipart uploads only sort-of address this. For one thing, the minimum "part" size is 5MB, so you can only resume at 5MB boundaries (or whatever part size you use). You also have to manage more state yourself.