As I grew tired of breadboard clutter and pulled out wires, I fell for Adafruit's $16 shield. Here's a pic of my still-messy setup:
Small complaints: it would be convenient to have extra screw (or insertion) connectors for GND, 3.3v and 5v. Also, When I screwed patch wires into the out-facing connectors the Pi footprint gets big.
Bigger complaint: Note the drawn-on red arrow and dotted line in the photo: That's the Pi camera ribbon cable. The dotted line indicates the approximate location of the camera socket beneath the shield. Before I added the shield the camera worked. But not after. As you can see, the camera is offset from the motherboard plug. Pushing the shield down twisted the ribbon and scratched off a few ribbon wires. Luckily, I have a spare cable but I'm not risking it with the Prototyping Pi. It's back to ye olde breadboard for me.
Two other thoughts:
1. Before I ever ordered the Pi camera I suspected that that cable was going to be trouble.
2. I take no pleasure in soldering. I would like a better breadboard where adding a new wire doesn't cause two previous wires to be loosened or pulled out. Any of you familiar with ZIF connectors?