Seen quite a few blogs/news articles taking about the new iOS5 Face Detection API "CIFaceFeature" which has properties like "hasLeftEyePosition", "hasRightEyePosition", "hasMouthPosition", ...etc. Would be interested to see how it really works.
Also, just wondering, what would be the result if we run it against Johnny Deep's famous "multiple-eyes" image? :-)
[UPDATE 2011-11-08] Yes it works! See this post about the result when I use this photo to run the face detection example... Quite cool!