Hey disco, thanks for the interest! I'm afraid I don't run a PBP of Icar. Although I am tempted, I really must get the next version (4) of the rules out first. Once I have done that, then there will be a froth of activity, including a PBP, no doubt!
Although that last post seems a little weak, I was intending on doing an Icar PBP before - I even got as far as writing a prototype for an online character sheet: http://www.chomisis.net/icar/character.html
You have to click on the Attribute and deviant wheels to change them. It was very much a proof of concept / work in progress. The Version 4 sheet is much prettier!