This is a great post/poll. I've been thinking about this lately. According to Andre, the hair-typing guy, hair like Yasmin Ghouri's (sp?) is rare, but from my experience here on the board we seem like a pretty large percentage of curlies. This would include incoherents, wavy/curlies, and combination 2/3a, and maybe those with a tiny bit of 3b somewhere. It really seems a pretty common hair type for those of european heritage, but it's also fairly easy to dry straight, so the reality of the curl may not be so readily apparent to the casual observer.
I hope you get lots of replies!