Plove has been completely rewritten under the skin. It is no longer a wrapper around grep, awk and gnuplot -- it boasts a powerful internal extensible data-flow engine (for filtering and processing output vectors before plotting), and a BLT-based plotting window (which allows a multiple plots via tabbed window, and these plots are a bit easier to customize than gnuplot-based ones were -- oh yes and they allow arbitrary zooming on the fly). [no longer available for download, get more recent versions instead]
The new Plove can also do scatter plot. Calculating histograms and cumulative distribution functions and various other refinements will come soon.
What else? opp_msgc now generates the pack/unpack operations so parallel simulation has become a lot more transparent. Plus a couple of bugfixes of course. The test suite (test/core) is supposed to pass completely, except for one little known bug in ev<< w/ Cmdenv.