Firstly, thank you for starting an open process of communication with Instawallet users. This is a very good start.
However, ...
pyedpyper,
Your letter was well written and captured my own posture on the matter very closely. I found almost all of the questions asked to be fair and realistic.
My losses are not great and not as great as yours. In my case, they are a small fraction of my BTC holdings, and partially out of a desire to promote the general health of the Bitcoin network which defines the value of my main stash it would be worthwhile to me to see attacks on the system resolved as thoroughly and professionally as possible. Thus, I feel inclined to join you in any formal and well thought out efforts to proceed on this adventure if necessary and if my participation may be helpful. Hopefully the organization responsible for Instawallet will demonstrate professionalism in reaching the best resolution possible and nothing very onerous or expensive will be necessary.
While I always considered the funds I had with Instawallet to be disposable, the fact that it was associated with an organization which appeared to be on a healthy business trajectory played a part in my decisions about how much to keep there. Further, the fact that 'Paymium family' choose to continue to operate Instawallet with their name on it was, to me, a valid reason to believe that they considered it security hardened enough to withstand attack.
Please feel free to PM me if need be. I'm an American citizen BTW.
Thanks - lets stay in touch if this needs to be taken further.