How do I access space in upper right of D7 sites

The upper right corner of most D7 sites - to the right of the banner - seems like it could be put to better use.   I was just going to play around with putting Google +1 code - Javascript - there.    What file should I edit to access this space?

/templates/base/_sub_header.html

There is '__main_logo__' but i assume you could use the '<bx_injection:injection_logo_after />' to insert the code, but honest i dont have a clue (yet) how to make use of the bx_injection.

Add this just before the closing body tag in _footer.html

<script type="text/javascript" src="http://apis.google.com/js/plusone.js"></script>
<div  style="display:block;position:fixed;top:10px;right:10px"><g:plusone></g:plusone></div>