An unofficial, hacked-together cost-estimator for Amazon's new, archival storage service, Glacier.
The calculator is hosted here.
Sometimes the best way to understand something complicated is to interact with it.
This tool helps elucidate the relationship between cost, data retention periods, and recovery scenarios. (See disclaimer below.)
This tool was built on quite a few assumptions and estimations. I can't attest to its accuracy. It's neither endorsed nor affiliated with Amazon AWS. The rates are referenced from the Glacier pricing page and Glacier FAQ.