The ‘main’ set of packages are at http://ubuntu.railscamp.net/ubuntu/main , no sources – only x64 and x86 binaries.
Partner packages are at http://ubuntu.railscamp.net/ubuntu/partner
Security updates http://ubuntu.railscamp.net/ubuntu/security
Sample sources.list:
deb http://ubuntu.railscamp.net/ubuntu/main hardy main restricted universe multiverse deb http://ubuntu.railscamp.net/ubuntu/main hardy-updates main restricted universe multiverse deb http://ubuntu.railscamp.net/ubuntu/partner hardy partner deb http://ubuntu.railscamp.net/ubuntu/security hardy-security main restricted universe multiverse
Totally untested, let me (Linc) know if there are any issues.