"Cloud Studio with OSGi support is finally out. Now it is possible to upload your bundles into S3 based bundle repository and create an instance profile (similiar to "Run Configuration" in Eclipse). After profile is created, an EC2 instance that hosts OSGi framework with required bundles can be launched." - late with this, but it's interesting nonetheless.
g-Eclipse (http://www.eclipse.org/geclipse) is an official eclipse.org project that aims to build an integrated workbench framework to access the power of existing Grid infrastructures. It provides a complete EFS implementation of S3 that allows a user to access files in S3 in a transparent way (see http://wiki.eclipse.org/G-Eclipse-Middleware-Extensions).