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The evolution of Grid computing technologies over recent years has been dominated by the adoption of a service-oriented paradigm and an increasing use of commercial Web services technologies. Closely linked to this transition are QoS mechanisms such as service level agreements. The work presented in this paper contributes to this evolution by proposing a service-oriented Grid infrastructure with on-demand Quality of Service support. The presented infrastructure is based on standard Web services technologies and enables the provision of compute intensive HPC applications as services in an automated way. The system employs a business-oriented model for Grid computing incorporating dynamic negotiation of service level agreements. The underlying QoS support relies on advance resource-reservation, application-specific resource requirement estimation and according dynamic resource pricing.