Download BOINC 3.x here.
BP6.Com BOINC team here.
Derek3.x has been released to Beta. We are aware of the problems running the CC and SAH apps on a Mac 10.2 machine and that issue is being worked on.
The SAH application had taken a few bug fixes that required the deployment happen sooner rather than later so the SAH team could continue to track down and fix the issues. The failure rates for the SAH application in Alpha are about half of that in Beta.