As most of you know, the trackback built into Pligg doesn't ping the source to show there is a trackback coming from your Pligg website.
I did an experiment with the following blog post I stumbled upon:
WPZOOM ›› 32 Unique RSS Icons usage
I added it to my Pligg site, but instead of using the URL above I used:
WPZOOM ›› 32 Unique RSS Icons usage
And my trackback appeared in their trackback list.
It appeared as pligg.com, but I have since edited that in my admin panel under Configure > Trackback
Heres the post on my Pligg site:
WPZOOM ›› 32 Unique RSS Icons usage / Top Stumbles
Not sure if this will work for everyone, but it worked for me, I will try a few other and see what happens.
Let us know if it works for you.
Geoserv.