Soft x-ray microscopy allows high resolution imaging of wet biological samples. 100A resolution has been demonstrated with contact microscopy while to date scanning microscopes have achieved 750A resolution. The present state of soft x-ray microscopy is reviewed with emphasis on scanning systems. We compare the various combinations of soft x-ray sources and focusing optics for scanning microscopes and summarize the present performance of the three operating synchrotron / zone plate scanning microscopes. Finally, we describe the SLanford tabletop scanning soft x-ray microscope which uses a laser-produced plasma source with normal incidence mirror focusing optics.