Since Amazon has an open API for its s3 Simple Storage Service, other cloud vendors (and even YOU) can spin up a similar service.http://blog.stone-head.org/s3tools-simple-storage-service-for-non-amazon-providers/
Rudy Godoy shows how you can use s3tools in Linux to tap into s3-like services both at Amazon and elsewhere.
You can use Amazon Web services free for a year, and
I'm pretty darned interested in doing I did just that.
I wouldn't say signing up for Amazon Web Services was easy, or that you don't need to possess a certain level of geeky experience, because you do. But if you know a minimum about how a Linux server goes together, you can do it.
One thing to note: Ubuntu is HUGE in the world of AWS. This is an area where it looks like they are either dominating, or well on their way to dominating.
I'm using Ubuntu 12.04 as the distribution for my Amazon EC2 server.