I recently updated to Photoshop CS5 and I noticed that "Pixels" is not an option to re-size to. I only see percent, inches, cm, mm, points and picas. I have also made sure that I have set all of my units to pixels in "my preferences". Am I missing something?
In the Image Size option menu, you will not have pixel as a unit in the "Document Size" pane. But the pane above it, "Pixel Dimensions" you have a choice of using px or % as units.