This isn't OpenMosix, but have you looked at hadoop?
http://lucene.apache.org/hadoop/I played with Mosix many years ago, before it was OpenMosix. I didn't do much with it, it was just a test.
However, hadoop looks very promising, and Yahoo! is even using it. I believe (and they should) Yahoo! is contributing to the project as well.
Among other things, it implements "MapReduce" which seems to be all the rage these days in processing ridiculous amounts of data.