It looks like Amazon is killing off it's unlimited storage plan and replacing it with a 1TB plan for the same monthly cost.
USA Today reports: "Amazon had the best deal in online storage - unlimited backup for $59.99 - but now unlimited is out. It has been replaced with tiered pricing, the system used by Amazon's rivals. The new rate, announced to customers Wednesday night, is now $59.99 yearly for 1 terabyte of online backup, with each additional terabyte (TB) costing an additional $59.99 annually. Additionally, Amazon is introducing a lower-priced tier set at 100 GBs of storage for $11.99 yearly."