The 's' that looks like 'f' is called the long s. There is a Wikipedia page for it.
I am so tempted to head to DC, considering I live 2 hours away. Are the crowds overwhelming now?
If you plan to come, better leave now... crowds are huge and finding parking might be a bit of a challenge.
As for the s-f dilemma, here's a photo I took of the original oath of office...
Also, never to be out done, I've created a upload folder where I will be sending photos from my iPhone throughout the day. This means you can see what I see... Which considering I didn't get tickets isn't going to be that much, but fun all the same...