Grid services are undergoing a veritable explosion of growth at the moment. But how do you choose a grid solution? Do you look for standards, Web services compatibility, development environment compatibility, or just marketing hype? With so much conflicting information out there on grid services and platforms, it can be difficult to identify whether a specific company is providing a service or a toolkit for building your own service. This article looks at the various grid development platforms available, and some grid initiatives and companies that provide ready-to-run grid services.