Check the right side bar - see the box called "Featured Face"? At the moment it's Williams Caslon Text.

...and if it's not, clear your browser cache!

And an archive list of previous Featured Faces is kept here:
http://typophile.com/node/52143

The last one was Alright Sans. http://okaytype.com/Typefaces/Alright_Sans/Overview/index.php