From the "unlikely, but not really unlikely" (especially given the open-source nature of the platform) section of geeky tech comes news that a developer at Chumby has fully ported Quake to the cuddly little system.
The developer posted details of how he did it on the Chumby dev forums. He's even working on getting it networked. Can you imagine a retro LAN party of Quake with everyone using Chumbys? Well I can't, but it would make for an interesting, albeit frustrating, experience--for about 30 minutes until everyone moved to Call of Duty 4.