Mac OS X: streaming audio between laptops35

In my workspace I use two laptops to increase the number of screens available (low quality picture of the setup I use).

I have everything the way I want it right now: the mouse, keyboard and clipboard are in sync using Synergy, and all my backup apps are installed on the Tibook (SuperDuper! and Retrospect, the best backup application for your small network), including the big external disks. They are connected with Gigabit ethernet so transferring files is a breeze, even gigabyte sized files.

I have only one last problem to solve: audio. I need to redirect all the audio of the TiBook to the Macbook, so that I can open sound apps in the TiBook and keep listening to them with the headphones I have on the Macbook.

Does anybody knows of an app that does this?