Following my previous post about the Sun Grid I stub bled upon the Amazon Elastic Compute Cloud (Amazon EC2) – Limited Beta announcement. It appears that there is a commercial resurgence of time-sharing. IBM is in the mix and has launched e-business on demand as part of this offering they are providing free grid time to ISV.
The community grid concept works, the proof is in the SETI@home project. Today the Berkeley Open Infrastructure for Network Computing (BOINC) provides the ability for users to join an open source grid community and offer cpu ticks to cure diseases, study global warming, discover pulsars, and do many other types of scientific research.