The 2.1 release is a bugfix release which includes:
- jQuery 1.5.1: There were issues with jQuery 1.5 and IE9. Among other things, 1.5.1 works with IE9.
- jQuery UI 1.8.11: This update was just released and we have it here.
- jQuery Form 2.67: A needed update to support jQuery 1.5.1.