AppleTV and distributed computing

When will my potential AppleTV or desktop iMac be able to help out my PowerBook on compute intensive image processing. I own all these computers, so I can install what I like. There are distributed computing environments eg Qmaster for a range of high end rendering applications like Final Cut Pro and Shake etc. So when will this become a reality in the home?

I can imagine a version of Aperture 2.0 which will look for local compute resources and send batches over Wifi to the computer and wait for response. I realise there are bandwidth issues, but say thumbnail processing following import or any batch operation would benefit.