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.
YP Log module allows snapshots of the YP directory listener counts to be logged for later analysis and graphing (although analysis and graphing have yet to be contributed).