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Possibly I would put scripts (and stuff) directly into the footer.php file (or the theme) to stop it having being pulled out of the database on each page. especially if the script is exactly the same on each page.
However scripts which are a littly dynamic (slight variation depending on on which page you are) could well be placed in the footer.
I have aslo spoken to people who feel all "scripts" should be in the header (or at least in one location) but I feel I can always find stuff by doing a good search.
kind regards, Highlander
edit: not actually sure when a script is a script and when its not. However the "script" you posted above looks more like an image with a link attached to it. I would say that the footer is an extremely good place for such a bit of code. !