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Release notes
Very similar to alpha3, only with a bit more polish (style fixes from Coder, E_NOTICE fixes, CSS fixes, potential minor bug fixes) and the return of hook_filefield(), in a different form though. The main feature of this release is therefore feature parity with the Drupal 5 version (disregarding the one or other minor exception), which was my precondition to go from alpha to beta. The *real* main feature of this release, of course, is preliminary image support over here, however that's technically not a feature of FileField itself :P
So now, go at it and test like there's no tomorrow! Report issues in the issue queue! And lastly, submit patches in order to improve what you care most about!
In short, have fun, and mind that this is still a *beta* version. Beta, like, for public testing but not for mass consumption. Things might still change anytime, especially in case maintainers of the other CCK file modules chime in with patches and/or input. Oh, and note that you should still be using CCK HEAD so that there's at least a chance for "Unlimited" multiple value support not to break completely. (At the time of writing, one patch is still pending in the CCK issue queue that needs to be applied before this stuff will work.)