I’ve attached the icons for Iron & Safari to this post (couple of both to choose from).
Regarding Iron, it could have been included as well at Chrome, as it’s based on Chromium. I find it strange it was seen as Mozilla (which uses Gecko), i/o Chrome, or at least Konqueror, which are based on khtml. Perhaps the site doesn’t actually check the engine of a new browser in an attempt to place it, but just labels any unknown browser as Mozilla. 
Maybe you can also check (if you have time), why the Vista & Chrome icons are not visible in the SubSilver layout (forum only, as we can see them in the Statistics page).
