I did a short presentation on NEON intrinsics at the recent Linaro Connect in Cambridge.
Click here to grab a PDF version. The original ODP version complete with animations and notes is in source control. Try:
bzr branch lp:~michaelh1/+junk/intrinsics-demo
The presentation is nice and technical and covers what NEON intrinsics are, what the types and functions look like, and a colour space conversion example comparing plain C, hand written assembly, and the (more readable? more maintainable? faster?) intrinsics version.