This paper introduces the One-Click Grid resource, which allows any computer with a Java enabled web browser to safely provide resources to Grid without any software installation. This represents a vast increase of the number of potential Grid resources that may be made available to help public interest research. While the model does make restrictions towards the application writer, the technology provides a real Grid model and supports arbitrary binaries, remote file access and semitransparent checkpointing. Performance numbers show that the model is usable even with browsers that are connected to the Internet through relatively weak links, i.e. 512 kb/s upload speeds. The resulting system is in use today, and freely available to any research project.