We are pleased to announce that Tizen 2.1 Beta source code and SDK are now available.
As a minor release, Tizen 2.1 Beta contains several new features and performance enhancements.
Downloading SDK Install Manager
Downloading SDK Image
Getting source code
http://review.tizen.org/git/  (Tizen 2.1 beta source codes are under tizen_2.1 branch.)
Getting binaries and images
How to flash to a device
We look forward to getting feedback and making additional enhancements to Tizen.
Tizen Technical Steering Group