Woo! Another alternative to Hadoop crawls out of Nokia Labs:
It's yet another Map-Reduce framework. This time the core is written in Erlang, and tasks are implemented in Python. Data transfer between nodes happens simply via HTTP.
There's no DFS implemented at all yet. It seems intended to run on Amazon EC2, where you'd just use S3 as your data store.
This feels like it might be a good fit for our needs, since we're a Python shop, and I'd rather hack on Erlang than Java. :)