DENSITY 5.0 is out. This new version, the first for several years, can translate data and model specifications from the GUI into commands for the R package 'secr'. Several features of marginal interest have been removed, and the rest of the GUI is generally cleaner. Some bugs have been fixed: the most important caused underestimation of SE for density estimates using the conditional likelihood. See http://www.otago.ac.nz/density for downloads and a list of changes.
Please report any problems, other than difficulty opening the chm help file (for that, see the phidot FAQ for Density | secr).