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Dijkgraaf - 1:26 am on Nov 4, 2010 (gmt 0)
Looks like it is actually something Google related. Probably Google Toolbar (GTB6.6).
I embedded the whole thing in html (see example below), and what you then see is a picture of a question mark, a minus sign, a check box and then the small square Google logo (like the favicon) with a magnifying glass.
<html>
<head>
<body>
<img alt="Embedded Image"
src="data:image/png;base64,iVBORw0KGgo..." />
</body>
</html>