The fourth (and probably final) 2.1 Beta distribution is now available for download on SourceForge. If you are planning on using new 2.1 features AND / OR upgrading an existing site to 2.1 - NOW is the time to test the upgrade with YOUR DATA and identify any remaining issues with new or existing features. The development team will actively work with you resolve any upgrade issues during this phase of the release cycle. If you are unable to test the release by downloading it - then the next best thing is to try out the new features, bug fixes, as well as the workflows you use most often by logging in to the public demo.
The team has been working hard to fix issues/ bugs as well as quite a few improvement suggestions reported by the community - and a third beta release of CiviCRM 2.1 is now available for download on SourceForge. We strongly encourage folks to download and test the beta release and help improve the final product. So test 2.1 Sandbox out now.