I wouldn't say the headers are "not useful." we just don't have a prepackaged module yet.
My hat's off to the fine volunteers who have brought us this amazing device and are working on the peripherals. You guys are doing great work.
Parallel to that, to everyone else, I offer this thought:
The RPi is a true developer platform. While it will be fun once the prebuilds are available, we need to work together as a community to *develop* those modules. Just because there isn't a prebuilt out yet, don't feel limited.
One of the things I am looking forward to, is seeing other peoples' takes on how the preipherals should work and act.
I'd love to have a choice of three of four CSI modules (heck, I might develop one of my own). The RPi is at the beginning of a potentially amazing lifespan. It's up to us to nurture it along.
I'm only wearing black until they find something darker.