I've knocked up a quick page which won't be widely publicised on the site, but thought it may be handy for those who follow the models, it allows a side-by-side comparison of the existing GFS and the parallel upgraded GFS.
http://www.netweather.tv/index.cgi?action=gfscomp;sess=
It's only for a selection of timeslots, and chart types, plus only uses the 00z and 12z runs at the moment (I'll look at adding the 06z and 18z's next week), but hopefully it'll come in useful while the parallel is running.