I will discuss observations of gaseous halos of nearby galaxies in the context of galaxy evolution. I will present evidence that most phases of such halos can be explained as a result of disk-halo cycling. However, recent work on the rotation of diffuse ionized gas halos presents a challenge to that interpretation and indicates that either we do not understand the dynamics of disk-halo flows well enough or we are seeing a mix of gas with a disk origin and primordial infalling gas. I will also present VLA 21-cm observations of the massive edge-on spiral NGC 5746, whose hot halo has been interpreted as an example of the "missing baryons". Recent models predict a rain of warm clouds onto disks as a result of thermal instabilities in such gas. I will discuss our findings for vertically extended atomic gas in this galaxy.