Thanks for all the replies on the shutter, its quieter
From what i know, and i don't know much, camera makers often buy sub-assemblies, like shutters. So if they need to shave costs, they can sub in a cheaper subassembly for that model. (i think) I shoot with a guy who has a D300s, and he is annoyed that its got a louder shutter than the D300, and the beeps can be heard 15 to 20 feet away. Not to whack Nikon, but it just goes to show that things can change within the same series.
Not to whack the K20D either, personally i'm going to keep mine indefinitely. It'll help me be patient until the price lowers a bit on the K5 - looks very good, i'm delighted that Pentax knocked this one out of the park.
Did i say that my K20 has actual doors over the plugins