The big news in the Ubuntu community today is that Ubuntu 8.10 Intrepid Ibex has been released right on schedule:
If you’d like to take it for a spin on EC2, brand new AMIs are available for 32-bit and 64-bit instances in both base install and desktop flavors.
You can find the latest AMIs for all Ubuntu releases on the following site with links to the public AMI documents on Amazon:
Ubuntu 8.10 is not an LTS (long term support release). It will be supported for 18 months. If you would like a bit more longevity, Ubuntu 8.04 LTS (Hardy) still has 4.5 years of life left in the server edition and is available from the same sites above.