Although 1.1 is not yet officially released, trunk is always pretty stable – as projects go, the Django team can be relied upon to keep the trunk tree extremely reliable – we run trunk in production, for example. For new projects, we recommend this option.
Legacy 0.96.3 is the last release before the 1.0 release which broke backward compatibility – it includes the older admin interface (with nested Admin classes), and the older Signals implementation – which provide a migration hurdle for many production environments – we have several customers and friends still running 0.96.3 until they address these migration issues. We can also help with this, if you need us.
The official released version, 1.02, is stable, and well-tested. We recommend this option for those conservative production environments that have full-blown separated test/staging and developent envoironments as well.
As always, if you need a specific legacy version (or a specific trunk svn release for that matter, or release-by-date) we will be happy to install it from svn on request, just plce your request in the “notes” field when you place your order.