mdsp @ smartelectronix has released MdspDuckVerb and also updated MdspCompressor and MdspDuckDelay with new GUIs, plus MdspDuckDelay and MdspFlanger have been ported to Mac OS X (VST).
MdspDuckVerb is similar to MdspDuckDelay, but with a reverb. The reverb output is compressed when there is a certain amount of signal present on its input. It allows you to use a lot of wet signal on a voice without loosing too much intelligibility.
MdspDuckVerb is available as a VST effect plug-in for Windows and Mac OS X and it is free (donations are welcomed of course).