I'm still not a huge fan of the naming system used - v3.0 is the v2.0 framework with what was previously known as WinFX added - Windows Communication Foundation, Windows Presentation Foundation and Windows Workflow. You can download the redistributable here:-

http://www.microsoft.com/downloads/details.aspx?familyid=10cc340b-f857-4a14-83f5-25634c3bf043&displaylang=en

Indigo (Yeah I know I'm supposed to call it Windows Communication Foundation), has reached the Beta 2 milestone. With this release you can apply for a Go-Live license to deploy the technology in live environments*

Read all about it here:-

http://msdn.microsoft.com/winfx/getthebeta/golive/

*Terms and conditions apply. Your small print may go down as well as up.