A systematic survey of cw ion laser operation in Ne, Ar, Kr, and Xe was conducted, using a small commercial laser plasma tube. Primary attention was given to the ultraviolet spectral region. Laser output was observed on virtually every known cw laser line as well as 27 lines not previously reported in the literature. Tentative atomic transition assignments have been made for some of these. Scaling of cw uV laser performance to high current density was investigated. Tests in a large commercial Ar laser system gave useful power output (0.2-1.0W) at a number of "non-standard" wavelengths.