Help! I'm bored

It's a Tuesday at 3:30 and I'm bored. Those not familiar with my normal work schedule are probably thinking 'so what,' but others are thinking 'huh?'
Normally by 3:30 I have a large number of pages fully laid out on computer and I'm starting on corrections. Sometimes I have a couple pages waiting for something, but this is normally a time where I have work to do. Today, not so much.
I'm only paid to be here until 5 p.m., but on Tuesday I'm normally here until 7 or 7:30 and I'm ok with that if there is work to do. Why is the ad sales person still trying to get ads? Why aren't they here? Oh right, because people here don't seem to understand my favourity journalist concept, deadlines. The work I have left to do will take me about 2 hours, but I can't start it yet. It's going to be a loong night.
I'm often bored at work, unfortunately, so I spend a lot of time randomly surfing the internet, trying to stay awake (admitedly sometimes I do take a mini nap) are there any suggestions of things to look at that aren't porn, and don't make any noise.