Not a fic, but still wonderful:

http://agirlandherfed.com/

A webcomic!

From the website FAQ:
"What is this comic about?

A Girl and Her Fed (AGAHF) is the story of a nameless Girl who finds that she is being watched by government agents. She and the Fed assigned to watch her form a partnership and attempt to untangle one hell of a knotty conspiracy."

This does nothing, of course, to explain the Pocket President program, the ghost of famous American historical figures, or the koala. But really, don't ask, just read.