First official release
The goal of the first version of OPAM was to get something released that would provide basic package management facilities to the community, but also be designed with distributed open-source design in mind. To that end, OPAM 1.0 supports a remotes mechanism which lets you combine local development trees with other people's remote Git or Darcs repositories. Whenever opam update is run, all the remotes are refreshed and merged, letting you subscribe to other people's compilers and package trees.
This first version is build-system agnostic in the interests of compatibility with the large existing body of third party external source code, and so can't do much in the way of advanced manipulation of the packages.
OPAM 1.0 has been a great success. Since its release, there have been hundreds of external contributions from the community, and over 1000 packages are now contained within the main package repository!