Check MIT's StarCluster project.
This short 5 minute video will explain it:
It is built with AWS EC2, Boto and the Sun Grid Computing Engine (Guess that's Oracle Grid Computing Engine now).
From my view.. they've layered a "grid" computing architecture on top of EC2 and I think it most likely could work with Eucalyptus and UEC.
from MIT's site:
StarCluster is available via the Python Package Index (PyPI) and comes with two public >>Amazon EC2 AMIs (i386 and x86_64). Below are instructions for installing the latest >>stable release of StarCluster via PyPI (recommended). There are also instructions for >>installing the latest development version from github for advanced users.
Just watch this short 5 minute video by MIT which explains what StarCluster does on EC2 very well.
After looking at it I think it should be easy to install and use with either Eucalyptus or Ubuntu's UEC as both share compatibility with AWS EC2 via boto/Euca2ools.
It only took me about 5 minutes to install StarCluster using Python's easy_install. Everything worked just as in the video.
There is a single master config file that is very easy to figure out and should be
able to make changes for Eucalyptus or UEC.