Lowest Possible Price for a 3-year Rental of 1 EC2 Compute Unit
(amount of RAM, scratch storage, etc. varies)

Over time, the price to rent 1 unit of resources for three years of continuous usage has fallen dramatically as Amazon lowers prices, offers new instance types, and offers new long-term pricing plans.
Price includes up-front reservation charge plus continuous hourly usage fees for 3 years
The price is defined as the lowest possible price regardless of instance type. For example, a High CPU instance offers 20X the compute power, but only costs 8X the amount. Similarly, a High Memory instance type offers 10X the main memory, but only costs about 6X the price. So the cost per unit (either compute or memory) dropped when these new instance types were announced.
The two resources are normalized to 1 EC2 compute unit (approximately equivalent to a 1.0 GHz CPU).
These prices are potentially overstated, since existing customers benefit from a price reduction just like new customers. So your total cost for a 3-year deployment in 2007 is lower if prices are reduced in 2008.

Lowest Possible Price (USD) for a 3-year Rental of AWS resources per GB of RAM
(number of EC2 compute units, total amount of RAM on the instance, amount of scratch storage, etc. varies)

Over time, the price to rent 1 unit of resources for three years of continuous usage has fallen dramatically as Amazon lowers prices, offers new instance types, and offers new long-term pricing plans.
Price includes up-front reservation charge plus continuous hourly usage fees for 3 years
The price is defined as the lowest possible price regardless of instance type. For example, a High CPU instance offers 20X the compute power, but only costs 8X the amount. Similarly, a High Memory instance type offers 10X the main memory, but only costs about 6X the price. So the cost per unit (either compute or memory) dropped when these new instance types were announced.
These prices are potentially overstated, since existing customers benefit from a price reduction just like new customers. So your total cost for a 3-year deployment in 2007 is lower if prices are reduced in 2008.

Lowest Possible Price (USD) for a 10-day Rental of 1 EC2 Compute Unit
(amount of RAM, scratch storage, etc. varies)

Over time, the price to rent 1 unit of resources for a short time (10 days of continuous usage) has fallen dramatically as Amazon lowers prices and offers new instance types.
Price includes hourly usage fees for 240 hours of use at on-demand prices
The price is defined as the lowest possible price regardless of instance type. For example, a High CPU instance offers 20X the compute power, but only costs 8X the amount. Similarly, a High Memory instance type offers 10X the main memory, but only costs about 6X the price. So the cost per unit (either compute or memory) dropped when these new instance types were announced.

Lowest Possible Price (USD) for a 10-day Rental of AWS memory, per GB of RAM
(number of EC2 compute units, total amount of RAM on the instance, amount of scratch storage, etc. varies)

Over time, the price to rent 1 unit of resources for a short time (10 days of continuous usage) has fallen dramatically as Amazon lowers prices and offers new instance types.
Price includes hourly usage fees for 240 hours of use at on-demand prices
The price is defined as the lowest possible price regardless of instance type. For example, a High CPU instance offers 20X the compute power, but only costs 8X the amount. Similarly, a High Memory instance type offers 10X the main memory, but only costs about 6X the price. So the cost per unit (either compute or memory) dropped when these new instance types were announced.