A couple of press releases from Ubuntu-land: “Ubuntu Launches Update Service for Support Subscribers” and “Canonical Creates Personal Package Archive Service for Ubuntu”
Read more about update service and personal packages
Individuals and teams can each have a PPA, allowing groups to collaborate on sets of packages, and solo developers to publish their own versions of popular free software. Developers upload packages to a PPA and have it built for multiple architectures against the current version of Ubuntu. Each user gets up to one gigabyte of Personal Package Archive space, which works as a standard Ubuntu software package repository. Free PPAs are available only for free (“libre”) software packages.