Recent developments in stable isotope technologies on the traditional (C,N,H,O,S) and non-traditional (e.g. Mg, Mo, Fe, etc) elements now allow for the determination of isotope compositions on individual molecular components. This working group will be highlighting the new techniques and technologies, as well as the novel applications including continuous flow stable isotope analysis. Applications to be discussed include, but are not limited to: analysis of nanomols of fatty acids and amino acids for deciphering food webs using essential compounds; tracking components of the carbon and nitrogen cycles; rapid analysis of microliter quantities of water for interpreting the hydrologic cycle; tracing global change and organic matter preservation through authentic compound determination or alteration. Participants are invited to bring a slide showing their own applications.