Fan Fiction...
As of now, no fan fiction has been submited, but if you run a search on fan fiction.net I'm sure you'll find some entries! I personally am in the process of writing my own Bartimaeus Trilogy fan fic. If you'd like to submit yours, please e-mail it to me.

With You
by ValkaryeRaven>
A rather amusing fic about Nathaniel getting banned from a shopping mall due to Barty's misdeeds. Inspired by a (semi) personal experience.