The members at somethingawful.com have kept tinkering with their Apple TV’s all day, and have made surprising progress. Amongst their achievements:

– They have the VLC player running on the box
– It has been noticed that components Apple Remote Desktop are installed, though no success in getting it working yet
– Some success getting SSH access up and running
– Where Finder.app would normally be is where the specialised interface app lives

Keep it up guys!