I don't really mean to necro this Thread, but I'd like to comment on a very specific topic.
Sorry, Gloom, but I think it is wrong to say that the Shards' intent is involved in the magic system. The workings of Allomancy itself - not looking at how and why it was it was obtained - is end-positive (I cannot find the WoB right now, but I'll edit it in later). You burn metals as a way of tapping the power of Preservation itself. Pushing and pulling on metals, rioting and soothing, etc. has little if anything at all to do with preserving anything.
It still takes part in it, but more in how or why it is obtained - as has been said over and over in this Thread. What Kurk and others suggest, on the other hand, is that we can look past any given Shards intent when it comes to the workings of the magic systems. Preservation's Intent has nothing to do with the burning of metals and its effects, just as Honour's has nothing to do with Gravity lashing.
Wait, whence did you get the mike? Also, up-vote for the in-depth look look at the process of tattooing.