What kit enables iPhone or iPad use for wearable computing? I am wondering if there are wearable computer kits for the iPhone or iPad, or are there resources on how to do it.

I would like to be able to, at a bare minimum, type text while walking, possibly do more like read text documents.
Wearable computing is an interesting problem. You can do some of it by getting something like the google glasses, which won't be released until next year at about $1500, or finding a vendor for the project. You would then have to get the adapter for your iDevice to output svga/dvi and interface that with the HUD (Heads up display)
Next, for input, you would likely have to get a bluetooth keyboard. There used to be a frogpad (not sure if they still make them) that supports bluetooth, but it is a chorded keyboard. Chorded keyboards take some getting used to, but can be very good and very fast once you do.

At the moment, I don't know of a kit you can buy to do this, it will likely take some work sourcing the parts like the glasses and keyboard.