I will be continuing to update and add resources here as I hear of them.
Desktop and Server Resources:
Download here: Alternate Download Site | Tableau Software
New features in 9.0 may be found here: http://www.tableau.com/new-features/9.0
Release Notes: 9.0 | Tableau Software
Updated Drivers: http://www.tableau.com/support/drivers
All new Online Help: http://www.tableau.com/support/help
Free On-Demand Training (all new videos): Tableau Training and Tutorials
Calculated fields while you work: Analytics in the Flow | Tableau Software
LOD Expressions Specific:
Understanding LOD Expressions: Understanding Level of Detail (LOD) Expressions | Tableau Software
Top 15 LOD Expressions: http://www.tableau.com/LOD-expressions
Training video for LOD expressions: Introduction to LOD Expressions | Tableau Software
Another very helpful new video under the "Why Does Tableau Do That" section: Fixing "Incorrect" Sorts with INDEX() | Tableau Software
Tableau Server 9.0 upgrade information: http://www.tableau.com/9.0-server-upgrade
Community Tableau Server Resources: Server Administration
Community Created Resources:
When posting questions to the community related to 9.0, please add the '9.0' tag to your post. This will help others to better know that your question relates to the new version.
Prashant Sharma has a great post with many of the posts from around the internet related to 9.0 and new features here:
And thanks to Zen Master an intro for the more advanced Tableau Users thanks to Joshua Milligan for this:New Tableau 9.0 Features Preview at DFW TUG. - YouTube.
Enjoy and share any links or content that you find helpful.