Seriously guys. Grab the code and refactor to your heart's content but let the man complete his work. None of this would have gotten off the ground if it weren't for Paul just doing it. So let's chill on the criticisms and cheer for the progress. I agree with dcb, get it done, then clean it up. The code is not that complex (though I need to have a look at the latest to see why Paul is storing the SREG as it's pushed on the stack for you during an interrupt).
To use the SVN analogy, let this tree grow before you try to prune it
My 2 cents.