This may just be my ignorance, but I was rummaging around in my WordPress directory and ran across an index.php file in my wp-content directory. There's nothing inside it except the remark "Silence is golden."
It may just be a cute file created by the upgrade, install routine, or a plugin, but I did a text search on the whole wordpress directory and didn't find a text string with "silence is golden" anywhere. That makes me think the unexpected appearance of the file could be a subtle sign of malicious hacking.
Anyone have a similar file/experience?