Parallelizing PostgreSQL for Cluster

Hi!

Is anyone looking at making postgreSQL scalable across a cluster of PCs?
That is, we have postgreSQL exuting queries which can be parallelised across
a cluster, either something along Informix's method of fragmenting the
tables across multiple disks, or Oracle's method of using a shared disk
(global file)architecture.

It would be interesting to have PostrgreSQL sitting on a Beowulf cluster
giving Informix XPS or Oracle OPS a run for their money :-)

Thanks for any info.

Laurence