New General SAP HANA FAQ:
http://www.saphana.com/community/blogs/blog/2014/09/09/the-sap-hana-faq
SAP Service Knowledge Based Article 2000003 - central SAP HANA notes
SAP Service Knowledge Based Article 1999997 - central SAP HANA In-Memory Notes
Is there a central location for all SAP HANA technical information?
Yes, please see this link to download all SAP HANA technical white papers.
https://www.experiencesaphana.com/docs/DOC-2171
How does HANA manage the persistency layer especially with write transactions in an OLTP system like SAP Business Suite?
Please see this SCN discussion for a very good and simple explanation:
http://scn.sap.com/message/14072433
How to get started with HANA in general?
Please review Marc Bernard's blog SAP HANA for Beginners
https://www.experiencesaphana.com/community/blogs/blog/2012/09/07/sap-hana-for-beginners
What is the HANA landing page on the SAP Developer Network ?
Please see attached link.
http://scn.sap.com/community/in-memory-business-data-management
What is the official HANA website to find more information?
Official SAP HANA page: SAP HANA