The WSS has certainly been the only other organisation I see openly protesting the Dorje Shugden ban, aside from the administration of this website. In a way, i can see that they are both working in tandem - one online and one off line, and both will reach a different audience.
Amongst the Dorje Shugden practitioners, i notice three different groups : WSS - with its public protests, DS.com - with its online presence, DS lamas - giving teachings in Tibet and Europe.
What I admire in WSS and the group behind DS.com is that they are passionate about Dorje Shugden and though they are not personally affected by the ban, they are very vocal about the injustice of the ban and the need for the ban to be lifted.
From having read much of the articles on this site, I know that DS.com believes that the Dalai Lama is working together with Dorje Shugden and that the ban is simply an illusory play in order to bring greater awareness of this Protector to the world at large.
WSS on the other hand, is very openly critical of the Dalai Lama, accusing him of lying and hypocrisy. Yet DS.com in its article promoting this open letter, can overlook this fundamental difference of opinion and focus on the motivation behind WSS, which is to lift the ban. In that sense, I think that it is very mature of DS.com to take this stance.
The Dorje Shugden lamas are quietly doing their work - giving teachings and Dorje Shugden empowerments - and do not seem to be involved in the politics behind the Dorje Shugden ban. Perhaps I am not aware of what they do behind the scenes but it looks that way. What the WSS and DS.com do is to support the work of these lamas so that Dorje Shugden practice can flourish and benefit many.
I think it is great that all Dorje Shugden practitioners can unite in a common goal to call for the ban on Dorje Shugden practice to be lifted because Dorje Shugden is not an evil spirit, as evidenced by the great lineage lamas who practice and propagate the practice in the world. As long as the ban is in place, there is much wrong view amongst buddhists, especially those who blindly follow the Dalai Lama, and there is much suffering amongst Dorje Shugden practitioners in Tibetan communities. While we in the west are able to practice freely, we must never forget our Tibetan dharma brothers and sisters who cannot.