Originally posted by Ash I believe you'll find ISO being displayed on depressing the OK button, both in viewfinder and the LCD display.
Yep. If you have the latest firmware on your K10D, v1.3, then you can display ISO instead of shots remaining by pressing the OK button at the back. If you want to change ISO, just press and hold the OK button, and turn the front e-dial. In modes where there is auto ISO, you can go to auto ISO by pressing and holding the OK button, and then pressing the green button.