Let's see, we've had 40, 50, 70, and 80, what's left? Well, now we have one of the answers: the new Nikon D60. This appears to be a simple D40x update. Still 10.2mp, but with a dust control system (sensor cleaning function plus directed airflow within the mirror box area).
Personally, I'd call this the D40xs myself, as all the changes are modest ones that didn't require deep design or critical part changes. Other things that were added: Active D-Lighting and automatic shut-off of the color LCD when you're looking through the viewfinder. Both those items are functional and useful additions. We also get a new battery, date imprint, stop motion animation support, an update to the metering system, none of which we needed. A couple of modest interesting additions: the rear LCD information display pivots with the camera and you can now have the camera process an already captured NEF into a JPEG. The one significant item that didn't make it into the update but should have is Live View.
Basically, it looks like Nikon concentrated on fixing the big issues that some have found with the D40x, a camera I already liked and think is under-rated. I expect a chorus of "disappointment" posts on the various Internet fora, but I think you need to look at the price/performance of this low-end camera.
Coupled with the new 18-55mm VR lens in the basic kit, the D60 makes one heck of a compact travel camera. Add a Sigma 30mm f/1.4 and a 55-200mm VR and you've got a pretty compact kit that can do most of what the consumer needs to do.