Following the release of their Python for Qt v1.0 RC1 a couple of weeks ago the PySide team is now "thrilled" (their word not mine) to announce the release of PySide: Python for Qt version 1.0.0. General improvements are in terms of bug fixes and what the team call "releasable quality", the next phase will be to concentrate on features.
Binary packages available for most Linux distributions, Microsoft Windows, Mac OS X, and Maemo 5 in addition to the source code packages. Downloads can be found Here
A list of PySide contributors is available