hey chris
The reality of facts is that we are overwhelmed by the success of arduino at the moment 
We're all super busy running workshop and working on our regular jobs. We are recruiting new members for the team which will improve the documentation soon.
A lot of the so called "shields" are used in our commercial projects and are working. we simply don't have the time to document them properly.
The bluetooth board uses a simple bluetooth to serial module sold by elfa. it's working but we never released it because we were not happy about the lack of flexibility on the bluetooth side.
We have now an arduino ethernet board at prototype stage. we are testing it. You'll see pictures of it on the website tonight.
I'll have a chat with david and we'll update the roadmap
thanks for the feedback
massimo