After six months of development Drupal 4.1.0 is now ready for some final testing. Drupal is currently in a feature freeze, and has been for quite some time, to make sure nothing breaks before the final 4.1.0 release.
If you have a Drupal site and you want to help testing, consider upgrading now. Anyone who doesn't have an old site and wants to help out can of course setup a Drupal site from scratch. All feedback is appreciated, good or bad.
The source code is available at: