I have some single frames that I took at high iso's that have really bad noise 1600 and 3200 on a crop sensor gets pretty bad sometimes. this tutorial has really helped me to manually remove or rather smooth alot of the noise generated by the high iso's on a per channel basis so I wanted to share this awesome technique. I would imagine that if you automated this process on a stack of images you could get a pretty good stack and maybe even better noise reduction http://planetphotoshop.com/remove-noise.html
