Grid computing presents unique challenges to IT Professionals.  It is a study in applied economics — unlimited demand versus constrained resources.  It is also usually a study in the Tragedy of the Commons.  Grid administrators must successfully satisfy their end user’s need for more compute and their finance organization’s need to control costs.
The Grid Computing Discipline
Grid Administrator Challenges
High job throughput for internal customers
High utilization for management metrics
Continuous uptime and availability
Optimization of third party tools in a scale-out environment
Constant re-balancing of queues/pools/resources
Accommodating  un-forecasted demand