A few hours ago, Amazon AWS announced that all EC2 instance types can now run 64-bit AMIs.

This is fantastic news!

You can now launch 64-bit operating systems on the Small and Medium instance types. This means that you can now create a single Amazon Machine Image (AMI) and run it on an extremely wide range of instance types, from the Micro all the way up to the High-CPU Extra Large and and the High-Memory Quadruple Extra Large, as you can see from the console menu: