Probably a silly question, but what's the deal with this?
<button ...
onclick="location.href='mailto:jashkenas@gmail.com?Subject=Code%20Read%20%5BSmall%5D'">
Small
</button>
Not a huge deal but I think it's good to show where a link goes on mouseover, especially a mailto: link (some mail clients take a while to start) ... it'd seem you want <a> here.